Energy Related Products (ErP) Directive – Heat Pump Efficiency

From 26th September 2015 all heating and hot water products, with an output equal to or less than 400kW will be affected by the Energy related Products (ErP) directive that comes into force. Energy labels are used for assigning heat pumps to individual classes based on their energy efficiency (heating efficiency). The best class is marked A++, the worst G. The deciding factor for determining energy efficiency is the seasonal SCOP heating factor. Methodology for determining energy efficiency is defined in BS EN 14 825.

How efficient are Master Therm heat pumps?

As a result of the advanced technology and inverter drive, the MasterTherm heat pumps are positioned among the most efficient and effective heat pumps on European and International markets.This is reflected in their classification and achieved heating efficiency Ƞs. The majority of Inverter driven MasterTherm heat pumps already comply with the future highest class of A+++ (coming into effect in 2019).


Air source Low temperature operation of 35°C Medium Temperature Operation 55°C
BoxAir Inverter performnace* SCOP Ƞs % class performance* SCOP Ƞs % class
BA 22I 5 kW 4,18 164 A++ 4 kW 3,22 126 A++
BA 26I 7,5 kW 4,40 173 A++ 7 kW 3,36 132 A++
BA 30I 8,5 kW 4,49 177 A++(+) 8 kW 3,45 135 A++
BA 45I 14 kW 4,30 169 A++ 13 kW 3,32 130 A++
*Performance - at the design outdoor temperature of -10 ° C. A ++ (+) - meets Class A +++ valid from r. 2019

Ground source Low temperature operation of 35°C Medium Temperature Operation 55°C
AquaMaster Inverter performance* SCOP Ƞs % class performance* SCOP Ƞs % class
AQ 22I 7 kW 4,61 177 A++(+) 6 kW 3,53 133 A++(+)
AQ 30I 11 kW 4,85 186 A++(+) 11 kW 3,78 143 A++(+)
AQ 45I 21 kW 4,80 184 A++(+) 19 kW 3,70 140 A++(+)
AQ 60I 33 kW 5,02 193 A++(+) 33 kW 3,97 151 A++(+)
AQ 90I 44 kW 4,87 187 A++(+) 43 kW 3,87 147 A++(+)
*Performance - at the design outdoor temperature of -10 ° C. A ++ (+) - meets Class A +++ valid from r. 2019

What is SCOP?

The seasonal heating factor represents the ratio between the total produced heat and the total electricity consumption. In contrast to the COP heating factor, which is specified for particular temperature conditions (for example, COP=3.2 at A2W35 – air temperature of 2 °C and heating water temperature of 35 °C), SCOP is calculated for the entire heating season. The SCOP factor thus characterises the real efficiency of heat pumps much more accurately conditions than the COP factor.

What is the heat pump seasonal energy efficiency?

Seasonal energy efficiency Ƞs represents a degree of utilisation efficiency of unrenewable primary energy by a particular heat pump. It is calculated as a ratio between the given heat pump seasonal heating factor and the electricity production and distribution coefficient, stated in %. For example, shall the seasonal energy efficiency amount to 150%, the heat pump will, during the entire heating season, supply energy that is by 50% greater than its primary energy consumption (i.e. the consumption of unrenewable energy necessary for the production of electricity for driving the heat pump).

For assessment purposes, 2 types of applications are recognised: medium-temperature applications, when the heat pump provides an output temperature of 55 °C, and low-temperature applications with an output temperature of 35 °C.

The inclusion of heat pumps in classes according to energy efficiency:

Class seasonal energy efficiency of heating Seasonal energy efficiency in heating Ƞs %
Low temperature 35°C Medium temperature 55°C
A++ Ƞs> 150 Ƞs> 125
A+ Ƞs= 123-150 Ƞs= 98-125
A Ƞs= 115-123 Ƞs= 90-98
B Ƞs= 107-115 Ƞs= 82-90
C Ƞs= 100-107 Ƞs= 75-82
D Ƞs= 61-100 Ƞs= 36-75


MasterTherm heat pump efficiencies

Display parameters

vzduch-voda Low temperature 35°C Medium temperature 55°C
BoxAir performance** SCOP Ƞs % class performance** SCOP Ƞs % class
BA 22Z 8 kW 3,66 144 A+ 8 kW 3,00 117 A+
BA 26Z 11 kW 3,63 142 A+ 10 kW 2,84 111 A+
BA 30Z 12 kW 3,64 143 A+ 12 kW 2,86 111 A+
BA 37Z 16 kW 3,71 145 A+ 15 kW 2,97 116 A+
BA 45Z 19 kW 3,89 153 A++ 18 kW 3,08 120 A+


vzduch-voda Low temperature 35°C Medium temperature 55°C
BoxAir Inverter performance** SCOP Ƞs % class performance** SCOP Ƞs % class
BA 22I 5 kW 4,18 164 A++ 4 kW 3,22 126 A++
BA 26I 7,5 kW 4,40 173 A++ 7 kW 3,36 132 A++
BA 30I 8,5 kW 4,49 177 A++(+) 8 kW 3,45 135 A++
BA 45I 14 kW 4,30 169 A++ 13 kW 3,32 130 A++
*performance* - at the design outdoor temperature of -10 ° C. A ++ (+) - meets Class A +++ valid from r. 2019


vzduch-voda Low temperature 35°C Medium temperature 55°C
EasyMaster performance** SCOP Ƞs % class performance** SCOP Ƞs % class
EM26Z 11 kW 3,62 142 A+ 10 kW 2,84 111 A+
EM30Z 12 kW 3,67 144 A+ 12 kW 2,88 112 A+
EM37Z 16 kW 3,74 147 A+ 15 kW 3,00 117 A+
EM45Z 19 kW 3,87 152 A++ 18 kW 3,04 119 A+
EM60Z 25 kW 3,56 140 A+ 24 kW 2,86 111 A+
EM75Z 31 kW 3,61 141 A+ 30 kW 2,92 114 A+


vzduch-voda Low temperature 35°C Medium temperature 55°C
AirMaster performance** SCOP Ƞs % class performance** SCOP Ƞs % class
AM3015Z 6 kW 3,60 141 A+ 6 kW 2,90 113 A+
AM3021Z 8 kW 3,73 146 A+ 8 kW 3,00 117 A+
AM3030Z 12 kW 3,87 152 A++ 12 kW 3,08 120 A+
AM3038Z 15 kW 3,90 153 A++ 15 kW 3,10 121 A+
AM3045Z 18 kW 3,93 154 A++ 17 kW 3,13 122 A+


země-voda Low temperature 35°C Medium temperature 55°C
AquaMaster performance** SCOP Ƞs % class performance** SCOP Ƞs % class
AQ22Z 8 kW 4,5 172 A++ 7 kW 3,17 117 A+
AQ26Z 10 kW 4,34 166 A++ 9 kW 3,11 116 A+
AQ30Z 11 kW 4,29 164 A++ 11 kW 3,16 118 A+
AQ37Z 14 kW 4,46 170 A++ 13 kW 3,16 118 A+
AQ45Z 17 kW 4,61 176 A++(+) 16 kW 3,19 120 A+
AQ50Z 18 kW 4,42 169 A++ 18 kW 3,37 127 A++
AQ60Z 23 kW 4,27 163 A++ 22 kW 3,14 118 A+
AQ75Z 28 kW 4,25 162 A++ 26 kW 3,11 116 A+
AQ90Z 33 kW 4,42 169 A++ 30 kW 3,10 116 A+
AQ120.2Z 47 kW 4,51 172 A++ 43 kW 3,22 121 A+
AQ150.2Z 57 kW 4,38 167 A++ 52 kW 3,19 119 A+
AQ180.2Z 64 kW 4,50 172 A++ 61 kW 3,35 126 A++
*performance* - at the design outdoor temperature of -10 ° C. A ++ (+) - meets Class A +++ valid from r. 2019

země-voda Low temperature 35°C Medium temperature 55°C
AquaMaster Inverter performance** SCOP Ƞs % class performance** SCOP Ƞs % class
AQ 22I 7 kW 4,61 177 A++(+) 6 kW 3,53 133 A++(+)
AQ 30I 11 kW 4,85 186 A++(+) 11 kW 3,78 143 A++(+)
AQ 45I 21 kW 4,80 184 A++(+) 19 kW 3,70 140 A++(+)
AQ 60I 33 kW 5,02 193 A++(+) 33 kW 3,97 151 A++(+)
AQ 90I 44 kW 4,87 187 A++(+) 43 kW 3,87 147 A++(+)
*performance* - at the design outdoor temperature of -10 ° C. A ++ (+) - meets Class A +++ valid from r. 2019