Household electric direct-acting room heaters - Methods for measuring performance

This standard applies to electric direct-acting room heaters. They may be portable, stationary, fixed, or built-in.
It does not apply to:
- thermal-storage room heaters (EN 60531);
- heating appliances incorporated in the building structure;
- central heating systems;
- heaters connected to an air duct;
- wall-paper, carpets or drapes incorporating flexible heating elements;
- sauna stoves.
This standard defines the main performance characteristics of direct-acting room heaters and specifies methods for measuring these characteristics, for the information of users.
This standard does not specify values for performance characteristics.
NOTE:
- This standard does not deal with:
- safety requirements (EN 60335-2-30);
- acoustical noise of fan heaters (EN 60704-2-2).

Elektrische Haushalt-Direktheizgeräte - Prüfverfahren zur Bestimmung der Gebrauchseigenschaft

Appareils électrodomestiques de chauffage des locaux à action directe - Méthodes de mesure de l'aptitude à la fonction

Gospodinjski sobni neposredni grelniki - Metode za merjenje funkcionalnosti - Dopolnilo A11

Ta standard se uporablja za sobne neposredne grelnike, ki so lahko prenosni, stacionarni, nepremični ali vgradni.
Ne uporablja se za:
– termoakumulacijske grelnike prostorov (IEC 531);
– grelne naprave, vgrajene v zgradbah;
– sisteme centralnega ogrevanja;
– grelnike, povezane s prezračevalnim kanalom;
– tapete, preproge ali draperije, ki vključujejo prilagodljive grelne elemente.
Ta standard določa glavne lastnosti delovanja sobnih neposrednih grelnikov in določa metode za merjenje teh lastnosti z namenom informiranja uporabnikov.
Ta standard ne določa vrednosti lastnosti delovanja.
OPOMBA: Ta standard ne obravnava:
– varnostnih zahtev (IEC 335-2-30);
– zvočnega hrupa ventilacijskih grelnikov (IEC 704-2-2).

General Information

Status
Published
Publication Date
14-Oct-2019
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
10-Oct-2019
Due Date
15-Dec-2019
Completion Date
15-Oct-2019

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SLOVENSKI STANDARD
SIST EN 60675:1998/A11:2019
01-november-2019
Gospodinjski sobni neposredni grelniki - Metode za merjenje funkcionalnosti -
Dopolnilo A11

Household electric direct-acting room heaters - Methods for measuring performance

Elektrische Haushalt-Direktheizgeräte - Prüfverfahren zur Bestimmung der
Gebrauchseigenschaft

Appareils électrodomestiques de chauffage des locaux à action directe - Méthodes de

mesure de l'aptitude à la fonction
Ta slovenski standard je istoveten z: EN 60675:1995/A11:2019
ICS:
97.100.10 Električni grelniki Electric heaters
SIST EN 60675:1998/A11:2019 en,fr

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60675:1998/A11:2019
---------------------- Page: 2 ----------------------
SIST EN 60675:1998/A11:2019
EUROPEAN STANDARD EN 60675:1995/A11
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2019
ICS 97.100
English Version
Household electric direct-acting room heaters - Methods for
measuring performance

Appareils électrodomestiques de chauffage des locaux à Elektrische Haushalt-Direktheizgeräte - Prüfverfahren zur

action directe - Méthodes de mesure de l'aptitude à la Bestimmung der Gebrauchseigenschaft

fonction

This amendment A11 modifies the European Standard EN 60675:1995; it was approved by CENELEC on 2019-06-17. CENELEC members

are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment the status of a

national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the

responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as

the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 60675:1995/A11:2019 E
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SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)
Contents Page

European foreword .......................................................................................................... 3

1 Modification to Clause 1, "Scope" .............................................................................. 4

2 Modification to Clause 2, "Normative references" ...................................................... 4

3 Modification to Clause 3, "Terms and Definitions" ...................................................... 4

4 Modification to Clause 4, "Classification" ................................................................... 9

5 Modification to clause 5, "List of measurements" ....................................................... 11

6 Modification to clause 6, "General conditions for measurements" .............................. 11

7 Modification to clause 7, "Dimensions, mass and means of connection to the

supply" ...................................................................................................................... 12

8 Modification to clause 11, "Stability of room temperature" ......................................... 12

9 Modification to clause 12, "Set-back" ......................................................................... 13

10 Modification to clause 13, "Frost protection temperature" .......................................... 13

11 Modification to clause 14, "Inrush current" ................................................................. 13

12 Modification to clause 16, "Measurement of the usable power" .................................. 13

13 Addition of clause 17, "Requirements to comply with functions according to ecodesign

regulation" ................................................................................................................. 14

14 Modification of Annex A, “Climatic test room” ............................................................ 18

15 Modification of Annex B, “Information provided at point of sales” ............................... 20

16 Modification of Annex C, “Test report form” ............................................................... 21

17 Additon of Annex ZZ .................................................................................................. 24

18 Modification of Bibliography ....................................................................................... 25

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SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)
European foreword

This document (EN 60675:1995/A11:2019) has been prepared by CLC/TC 59X/WG 12 “Electric

room heating appliances”.
The following dates are fixed:
• latest date by which this document has to (dop) 2020-03-17
be implemented at national level by
publication of an identical national standard
or by endorsement
• latest date by which the national standards (dow) 2022-06-17
conflicting with this document have to be
withdrawn
This document has been prepared under a mandate given to CENELEC by the European

Commission and the European Free Trade Association, and supports essential requirements of

EU Directive(s).

For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of

this document.

The purpose of this amendment is to specify essential performance characteristics of direct

acting room heaters and to describe methods for measuring of these characteristics related to

EU Commission regulation (EU) No 2015/1188 and standardization request from the EU

Commission M/550.
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SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)
1 Modification to Clause 1, "Scope"
Replace the whole clause with:

This standard applies to electric direct-acting room heaters. They may be portable, stationary,

fixed, or built-in.
It does not apply to:
– thermal-storage room heaters (EN 60531);
– heating appliances incorporated in the building structure;
– central heating systems;
– heaters connected to an air duct;
– wall-paper, carpets or drapes incorporating flexible heating elements;
– sauna stoves.

This standard defines the main performance characteristics of direct-acting room heaters and

specifies methods for measuring these characteristics, for the information of users.

This standard does not specify values for performance characteristics.
NOTE This standard does not deal with:
—safety requirements (EN 60335-2-30);
—acoustical noise of fan heaters (EN 60704-2-2).
2 Modification to Clause 2, "Normative references"
Replace the whole clause with:

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

EN 60584-1:2013, Thermocouples - Part 1: EMF specifications and tolerances (IEC 60584-

1:2013)
3 Modification to Clause 3, "Terms and Definitions"
Replace the whole clause with:
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
local space heater (as defined in EU regulation (EU) No 2015/1188)

space heating device that emits heat by direct heat transfer or by direct heat transfer in

combination with heat transfer to a fluid, in order to reach and maintain a certain level of human

thermal comfort within an enclosed space in which the product is situated, possibly combined

with a heat output to other spaces and is equipped with one or more heat generators that convert

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SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)

electricity or gaseous or liquid fuels directly into heat, through use of the Joule effect or

combustion of fuels respectively
3.2
direct-acting room heater

appliance which converts electrical energy into heat after a demand for heat has arisen in a

room and transfers this heat to the room directly

Note 1 to entry: In this standard, a direct-acting room heater is referred to as a heater.

3.3
panel heater

heater in which the temperature rise of all surfaces in contact with the circulating air does not

exceed 75 K in normal use
Note 1 to entry: Panel heaters may be oil filled.
Note 2 to entry: Panel heaters may be in column form.
Note 3 to entry: Panel heaters may include fluids and moving parts.
3.4
convector heater

heater in which the temperature rise of at least one non-visible part in contact with the

circulating air exceeds 75 K in normal use; the air is discharged through one or more outlets by

natural convection

Note 1 to entry: "Non-visible part" means that the part cannot be seen from a point situated 2 m in front

of the heater and 1,2 m above the floor when the heater is installed.
3.5
fan heater
heater in which the movement of air through it is accelerated by a fan
3.6
radiant heater
category 1
radiant heater

heater in which the temperature rise of at least one visible surface exceeds 75 K in normal use

Note 1 to entry: The visible surface may be seen through solid material which is transparent to heat

radiation. Materials such as quartz glass are considered to be transparent to heat radiation, while ordinary

glass is not.
category 2
electric radiant local space heater (as defined in (EU) No 2015/1188)

electric local space heater in which the heat emitting element is to be directed towards the place

of use so that its thermal radiation directly warms the subjects to be heated and which has a

temperature rise of the grill covering the heat emitting element of at least 130 K in normal use

and/or a temperature rise of 100 K for other surfaces
category 3
visibly glowing radiant heater

radiant heater in which the heating element is visible from the outside of the heater and has a

temperature of at least 650 °C in normal use
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SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)
3.7
fixed local space heater

electric local space heater not intended to accumulate thermal energy and designed to be used

while fastened or secured in a specific location or wall mounted and not incorporated in the

building structure or building finishing

Note 1 to entry: Heaters with a heat retention of less than 20 % according to EN 60531 are still within

the scope of this standard.

Note 2 to entry: Heaters having an installed weight exceeding 18 kg which are not fixed but belong to

the category of stationary applainces are considered as fixed lacal space heaters.

3.8
portable local space heater

electric local space heater not intended to accumulate thermal energy and designed in such a

way that it can be placed in different locations without the use of tools
3.9
slave heater

electric local space heater which is not capable of autonomous operation and needs to receive

signals sent from an external master controller, not being part of the product but connected to

it by pilot wire, wireless, power line communication or an equivalent technique, in order to

regulate the emission of heat into the room in which the product is installed
3.10
room temperature control

mechanical or electronic device, sensitive to the room temperature and adjustable by the user

3.11
set-back function

function which allows the room temperature to be maintained at a lower value than the pre-set

(comfort) temperature without changing the setting of the room temperature control

3.12
frost protection means

means which allows the room temperature to be maintained at a value of 7 °C ± 3 °C

Note 1 to entry: The means may be a particular setting of the room temperature control.

3.13
rated power input
power input assigned to the heater by the manufacturer
3.14
energy ratio

ratio between the energy consumption during a representative period of operation and the

product of the rated power input and this period
3.15
average room temperature

arithmetic average of the maximum and minimum room temperatures for a setting of the room

temperature control
3.16
amplitude

difference between the maximum and the minimum room temperatures for a setting of the room

temperature control
3.17
drift

difference between the average room temperatures obtained at different energy ratios for a

setting of the room temperature control
---------------------- Page: 8 ----------------------
SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)
3.18
nominal heat output
nom

heat output of a local space heater comprising both direct heat output and indirect heat output

(where applicable), when operating at the setting for the maximum heat output that can be

maintained over an extended period , as declared by the manufacturer, expressed in x,x kW

3.19
minimum heat output (indicative)
Pmin

heat output of a local space heater comprising both direct heat output and indirect heat output

(where applicable), when operating at setting of the lowest heat output, as declared by the

manufacturer, expressed in [x,x/N.A.] kW
3.20
maximum continuous heat output
max,c

declared heat output of an electric local space heater when operating at the setting for the

maximum heat output that can be maintained continuously over an extended period, as declared

by the manufacturer, expressed in x,x kW
3.21
electric power requirement in standby mode
elsb

electric power consumption of the product while in standby mode, expressed in x,xxx kW

Note 1 to entry: This is only applicable if the product has a “standby mode”. For electric local space

heaters without a standby mode the value is zero.
3.22
standby mode

state of the product where the heating function has been deactivated without disconnection

from mains or switching power off. Independent from external conditions (room temperature,

time, or control signals) the unit will not start heating; to resume the heating function a (manual)

reactivation by the user is required; where in standby mode only the following functions are

provided, which may persist for an indefinite time:

— reactivation function, or reactivation function and only an indication of enabled

reactivation function, and/or
— information or status display.
3.23
auxiliary electricity consumption – at nominal heat output
elmax

value is zero for electric local space heaters; all electric power consumption is included in the

nominal heat output (Pnom
3.24
auxiliary electricity consumption – at minimum heat output
min

value is zero for electric local space heaters; all electric power consumption is included in the

minimal heat output (P )
min
3.25
single stage heat output, no room temperature control

means the product is not capable of varying its heat output automatically and that no feedback

of room temperature is present to adapt the heat output automatically
---------------------- Page: 9 ----------------------
SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)
3.26
two or more manual stages, no room temperature control

means the product is capable of varying its heat output manually by two or more levels of heat

output and is not equipped with a device that automatically regulates the heat output in relation

to a desired indoor temperature
3.27
mechanical room temperature control

means the product is equipped with a non-electronic device that allows the product to

automatically vary its heat output over a certain time period, in relation to a certain required

level of indoor heating comfort

Note 1 to entry: Varying the heat output can be achieved by variable intermittent switching of the power.

3.28
electronic room temperature control

means the product is equipped with an electronic device, either integrated or external, that

allows the product to automatically vary its heat output over a certain time period, in relation to

a certain required level of indoor heating comfort

Note 1 to entry: Varying the heat output can be achieved by variable intermittent switching of the power.

3.29
electronic room temperature control plus day timer

means the product is equipped with an electronic device, either integrated or external, that

allows the product to automatically vary its heat output over a certain time period, in relation to

a certain required level of indoor heating comfort, and allows the setting of timing and

temperature level for a 24-h timer interval
3.30
electronic room temperature control plus week timer

means the product is equipped with an electronic device, either integrated or external, that

allows the product to automatically vary its heat output over a certain time period, in relation to

a certain required level of indoor heating comfort, and allows the setting of timing and

temperature levels for a full week; during the 7-day period the settings shall allow a variation

on a day-to-day basis
3.31
room temperature control, with presence detection

means the product is equipped with an electronic device, either integrated or external, that

automatically reduces the set-point for the room temperature when no person is detected in the

room
3.32
room temperature control, with open window detection

means the product is equipped with an electronic device, either integrated or external, that

reduces the heat output when a window or door has been opened; whenever a sensor is used

to detect the opening of a window or door, it can be installed with the product, externally to the

product, built into the building structure or as a combination of those options
3.33
distance control option

function that allows remote interaction from outside the building in which the product is installed

with the control of the product
3.34
adaptive start control

function which predicts and initiates the optimal start of heating up in order to reach the set-

point temperature at the desired time
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SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)
3.35
working time limitation

means the product has a function that automatically deactivates the product after a pre-set

period of time

Note 1 to entry: The heater needs an active manual action or from external transmitted signal to be able

to start with heating again.
3.36
black bulb sensor

means the product is equipped with an electronic device, either integrated or external, that

measures air and radiant temperature
3.37
intended for outdoor use

means the product is suitable for safe operation outside enclosed spaces, including possible

use in outdoor conditions
3.38
seasonal space heating energy efficiency

ratio between the space heating demand, supplied by a local space heater and the annual

energy consumption required to meet this demand, expressed in %

Note 1 to entry: The seasonal space heating energy efficiency is calculated using the methods described

in Annex III of regulation (EU) No 2015/1188, taking into account the definitions and product categories

in the standard.
3.39
period and duty cycle

duty cycle is the fraction of one period in which the system is supplying power to the heating

element, expressed as % of a period

Note 1 to entry: A period is the time it takes for a system to complete a full cycle.

Note 2 to entry: A period (or full cycle) duration is expressed in the term of min. For electric heaters a

period is an active mode to perform the intended function of a stream of heat accommodated to the

varying demand. Period duration could be initiated by an internal clock function integrated in the control

device or given by the influence of ambient temperature and heat demand.
3.40
transitional period

lapse of time between the initiation of a defined temperature level and the actual achievement

of the temperature level; typical transition periods of indefinite duration occur when the heat

demand changes from comfort to set-back and set-back to comfort levels

Note 1 to entry: Additional heat load to the room, not initiated by the heater, could also trigger a

transitional period of indefinite duration.
4 Modification to Clause 4, "Classification"
4.1 According to type
Replace by:
The following type of heater apply:
− local space heater;
− direct acting room heater;
− panel heater;
− convector heater;
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SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)
− fan heater;
− radiant heater;
o category 1
o category 2
o category 3
− fixed local space heater;
− portable local space heater;
− slave heater.

The type of heater shall be stated and if applicable state the category of the regulation 2015/1188.

NOTE 1 A heater may be a combination of two or more types.

NOTE 2 If there is doubt regarding the type of heater, the temperature rise of the relevant surfaces is

determined.
NOTE 3 Examples of types of heaters are shown in Figure 1.
4.2 According to regulating features
Replace by:
The following regulating features apply:
− heater without regulation
− heater with single stage heat output;
− heater with adjustable power input;
− heater with regulated air flow (fan heaters only);
− heater with a room temperature control;
− heater with a programmer;
− heater with a mechanical room temperature control;
− heater with an electronic room temperature control;
− heater with an electronic room temperature control plus day timer;
− heater with an electronic room temperature control plus week timer;
− heater with a set-back function;
− heater with a presence detection;
− heater with an open window detection;
− heater with an adaptive start control;
− heater with a distance control option;
− heater with frost protection means;
− heater with a black bulb sensor;
− heater with working time limitation.

If the heater has features such as means for connection to an external control, details are to

be stated.

NOTE An example is a heater having means for receiving an external signal for operating the set-

back device.
A heater may have more than one regulating feature.
The regulating features of the heater shall be stated.
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SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)
5 Modification to clause 5, "List of measurements"
Modify by:
Performance is determined by means of the following measurements:
– dimensions and mass of the heater, length of the supply cord (Clause 7);
NOTE 1 This measurement is suitable for all heaters.
– temperature rises of air-outlet grilles and external surfaces (Clause 8);

NOTE 2 The measurement of temperature rises of air-outlet grilles is suitable for convector heaters

and fan heaters.

NOTE 3 The measurement of temperature rises of external surfaces is suitable for all heaters but is

not applicable to those for mounting at a height above 1,8 m, to the back of wall-mounted heaters and

to visibly glowing radiant heaters.
– temperature rises of surfaces surrounding the heater (Clause 9);
NOTE 4 This measurement is suitable for all heaters.
– warming-up time of the heater (Clause 10);
NOTE 5 This measurement is suitable for all heaters.
– stability of room temperature (Clause 11);
NOTE 6 This measurement is suitable for heaters with a room temperature control.
– set-back (Clause 12);
NOTE 7 This measurement is suitable for heaters with a set-back device.
– frost protection temperature (Clause 13);
NOTE 8 This measurement is suitable for heaters with frost protection means.
– inrush current (Clause 14);
NOTE 9 This measurement is suitable for all heaters.
– effect of radiant heat (Clause 15);

NOTE 10 This measurement is suitable for all heaters except fan heaters and heaters for mounting at

a height above 1,8 m.
– maximum continuous heat output (Clause 16);
– nominal heat output (Clause 16);
– minimum heat output (Clause 16);
– electric power requirement in standby mode (Clause 16).
NOTE 11 This measurement is suitable for all heaters. Refer to EN 50564:2011.
The results of these measurements may be given in a test report.
NOTE 12 An example of a test report form is shown in Annex C.
6 Modification to clause 6, "General conditions for measurements"
Modify NOTE 3 as follows:

NOTE 3 The intention is to obtain an energy ratio of 100 %. If this cannot be obtained due to the room

temperature control cycling, even at the lowest limit of the test room temperature, this control is short-

circuited or otherwise rendered inoperative.
Addition of a bullet at the end of the clause:

− External temperature controls or separate room temperature sensors are tested in the

climatic test room in a position according to the specification given in the installation guide.

If not specified, the External temperature control or separate room temperature sensor is

positioned at one of the sidewalls – 1,2 m above the floor 2 m distance to the window

surface.
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SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)
7 Modification to clause 7, "Dimensions, mass and means of
connection to the supply"
Modify last sentence as follows:

The length of the supply cord is stated in m, rounded down to the nearest 0,05 m, or it is stated

that the heater is for connection to fixed wiring.
8 Modification to clause 11, "Stability of room temperature"
Delete the hanging paragraph and integrate in 11.1.
11.1 Basic method of evaluation
Modify by:

The amplitude and drift are determined for heaters incorporating an integrated or remote

room temperature control.

The heater is placed in the test chamber of a climatic test room A or B (see Annex A).

The temperature inside the test chamber is measured for three different energy ratios which

are obtained by changing the temperature in the refrigerating chamber, without changing the

setting of the room temperature control. The measurements are made when the average

room temperature is stable over a period of five consecutive fluctuations or 2 h, whichever

is shorter.

The first measurement is made with the room temperature control set to give a temperature

in the test room between 20 °C and 25 °C at a high energy ratio. The high energy ratio is

(80 ± 5) % but if the ratio is not attainable due to the capacity of the climatic test room, the

highest possible energy ratio is used.

NOTE 1 If the energy ratio of (80 ± 5) % cannot be attained with a heater belonging to a family, the method

of 11.2 is used instead.

The temperature of the refrigerating chamber is then increased to give an energy ratio of (50

± 5) %, the third measurement is made with a low energy ratio. The low energy ratio is (20

± 5) %, but if this results in heat-losses less than 150 W, the low energy ratio is that

corresponding to 150 W.
The amplitude is determined for the energy ratio of (50 ± 5) %.

The drift is determined from the average room temperature at the high and low energy

ratios using the following formula:
Dt()−t
B A
A−B
where
D is the drift;
t is the average room temperature at the high energy ratio;
t is the average room temperature at the low energy ratio;
A is the measured value of the high energy ratio;
B is the measured value of the low energy ratio.
NOTE 2 In the formula, 60 is the difference between the ratios of 80 % and 20 %.

NOTE 3 If the average room temperature at the energy ratio of 50 % does not fall between t and t , the

A B

formula is not applicable and the maximum difference of the three values is stated as the drift.

The amplitude and the drift are stated to the nearest 0,1 K.
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SIST EN 60675:1998/A11:2019
EN 60675:1995/A11:2019 (E)
11.2 Method for a family of heaters
Modify the first paragraph with:

The amplitude and drift for a family of heaters may be determined using the following

procedure. Heaters are considered to belong to a family when they have the same basic

construction and have:

– the same dimensions except that the length of the heating element is proportional to the

rated power input;
– the same room temperature control;

NOTE room temperature controls are considered to be the same if they have the same type reference, and for

electronic room temperature controls, the same triac and heat sink if these components influence the sensor.

– the same arrangement for the space containing the room temperature control;

– the same construction at the end of the heating element adjacent to the space containing

...

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