Comparing the regulation text and formulas

The following tables show the differences between the formulas and descriptive texts in the old and new regulations.

The seasonal space heating efficiency η_s is calculated differently for

Gaseous and liquid fuel domestic LSH
Electric domestic LSH
Gaseous or liquid fuel commercial LSH

The calculation uses LSH-type depending correction factors F(1) to F(5). They are for both regulations defined as follows:

η_S is reduced by
- F(1) (commercial LSH) options for the heat output:
  - Single stage LSH: 5%
  - Two stage: 2,5 to 5%, depending on stage power relation
  - Modulating: 0 to 5%, depending on lowest power
    (In regulation (EU) 2015/1188 F(1) also accounted for a positive contribution to ηS of electric storage LSH due to adjusted contributions for options for heat storage and output.)
- F(4) auxiliary electricity consumption
- F(5) energy consumption of a permanent pilot flame
η_S is increased by controls of indoor heating comfort (e.g. thermostats, start or distance control, self-learning, etc.)
- F(2): Mutually exclusive values, i.e. cannot be added (0 to 0,19)
- F(3): Values can be added to each other (up to 0,04)

Moreover, the following two parameters are used for calculations:

η_s,on is the seasonal space heating energy efficiency in active mode, expressed in %;
CC is the conversion coefficient for electricity (2,5 for (EU) 2015/1188 and 1,9 for (EU) 2024/1103).

See the table below.

Old regulation (EU) 2015/1188

New regulation (EU) 2024/1103

Calculation of the seasonal space heating energy efficiency η_s

Annex III, 5, a.

For domestic LSH:

η_{S =}η_S,on - 10% + F(1) + F(2) + F(3) - F(4) - F(5)

Annex III, 4, (1.)
The seasonal space heating energy efficiency of LSH is defined as:

(a) for gaseous and liquid fuel domestic LSH:

(b) for electric LSH:

For non-commercial LSH

η_S = η_th,nom * (0,75 + F(2) + F(3)) * F(4) * F(5) / CC

where:

η_th,nom = useful efficiency at Pnom based on NCV (100% for electric LSH)

For commercial LSH

Luminous LSH

η_S = 0,856 * ηS,RF – F(1) – F(4) – F(5)
Tube LSH

η_S = ((0,15 * η_th,nom + 0,85 * η_th,min) – F_env) * ((0,94 * RFS) + 19) / (0,46 * RFS) + 45) – F(1) – F(4) – F(5)

Where:

η_th,nom / η_th,min = useful (thermal) efficiency at nominal/minimum heat output
(P_nom / P_min) based on GCV (100% for el. LSH)
Envelope losses (0% if tube in heated space, else 2,2 to 6,0%)
RFS = share of infrared output in relation to input (15% weight on P_nom and 85% on P_min)

Calculation of correction factors F(1) to F(5)

Annex III, 5, (c)

Correction factor F(1) for electric storage LSH

If the product is equipped with (only one option may apply):	F(1) is increased by
Manual heat charge control, with integrated thermostat	0,0 %
Manual heat charge control with room and/or outdoor temperature feedback	2,0 %
Electronic heat charge control with room and/or outdoor temperature feedback or controlled by energy supplier	3,5 %

In case the heat output of the electric storage local space heater is assisted by a fan, an additional 1,5 % shall be added to F(1).

In the new regulation, there is no correction factor F(1) for electric storage LSH.

For commercial:

If the heat output control type of the product is:	F(1) (%)	With the following limits
Single stage	F(1) = 5
Two stage		2,5% ≤ F (1) ≤ 5,0%
Modulating		0% ≤ F (1) ≤ 5,0%

Please view table 7 in Annex III, 5 (d)

Correction factor F(2)

Correction factor F(2):

Type of room temperature control	For electic LSH				For gaseous and liquid fuel LSH
Type of room temperature control	Portable	Visibly glowing radiant	Fixed, storage, underfloow	Towel rails	For gaseous and liquid fuel LSH
None + single stage heat output	0
None + two or more manual stages	0,025	0,05	0	0,03	0,025
Mechanic thermostat	0,1	0,025		0,03	0,05
Electronic	0,16	0,08	0,05	0,03	0,1
Electronic plus day timer	0,17	0,1	0,095		0,125
Electronic plus week timer	0,19	0,12	0,15

See also table 10 in Annex III, 4, (4)

Please view table 8 in Annex III, 5 (e)

Correction factor F(3)

Please view table 11 in Annex III, 4, (5)

Correction factor F(3)

Annex III, 5 (f)

Correction factor F(4)

For electric LSH:

Where:

el_sb is the standby electric power consumption, expressed in kW;
P_nom is the nominal heat output of the LSH, expressed in kW;
α is a factor taking into account whether the product complies with the limit values of Commission Regulation (EC) 1275/2008:
- If yes, α is by default 0 (zero),
- If no, α is by default 1,3.

For domestic LSH using gaseous or liquid fuels:

Where:

el_max is the electric power consumption at nominal heat output, expressed in kW;
el_min is the electric power consumption at minimum heat output, expressed in kW. In case the product does not offer a minimum heat output, : el_min= el_max;
el_sb is the electric power consumption of the product in standby mode, expressed in kW
P_nom is the nominal heat output of the product, expressed in kW

For commercial LSH

Annex III, 4, (6)

Correction factor F(4)

(a) for gaseous and liquid fuel LSH except commercial LSH:

where:

el_max is the electric power consumption at nominal heat output, expressed in kW;

el_min is the electric power consumption at minimum heat output, expressed in kW. In case the product does not offer a minimum heat output, the value for the electric power consumption at nominal heat output shall be used;
P_nom is the nominal heat output of the product, expressed in kW;

(b) for commercial LSH:

F(4) = 1

Requirements on low power modes

Requirements concerning low power modes are not included in the old regulation

Annex III, 5
LOW POWER MODES

All low power modes oldly implemented in LSH generate additional energy consumption. Therefore, specific ecodesign requirements for low power modes, including idle mode or networked standby mode, are set out in the new regulation both for LSH and separate controls

The power consumption of the off mode (P_o), standby mode (P_sm), and where applicable the idle mode (P_idle) and the networked standby mode (P_nsm) are measured, expressed in W and rounded to two decimal places.
During measurements of the power consumption in low power modes, the following functions shall be checked and recorded: (a) the display or not of information; (b) the activation or not of a network connection. If the standby mode includes the display of information or status, this function shall also be provided when the networked standby is provided.
For separate related controls, the power consumption of the low power modes shall be measured at the mains voltage. If the power consumption of the low power modes can only be measured at a DC voltage level, the results of these measurements shall be multiplied with a factor 1,5.

Requirements on control accuracy (CA) and control to setpoint deviation (CSD)

Requirements concerning control accuracy and control to setpoint deviation are not included in the old regulation

ANNEX III, 6.
CONTROL ACCURACY AND CONTROL TO SETPOINT DEVIATION
For LSH and for separate related controls, CA and CSD shall be measured whenever the manufacturer declares a CA < 2K and a CSD < 2K.

Where:

Control accuracy (CA) means the degree of ability of the control of a LSH to react to changes in the zone temperature in order to keep that zone temperature as close as possible to the setpoint zone temperature;
Control to setpoint deviation’ (CSD) means the difference between the mean zone temperature measured over a period of time and the setpoint zone temperature;