Page 154 - General Catalogue

Case study

Replacing a gas boiler with a Daikin Altherma hybrid
heat pump means saving on running costs for both space

heating and domestic hot water supply.

A running costs comparison is made below based on parameters for a typical Belgian winter.
As a result of the hybrid principle, the most cost-efficient operation will be used no matter
the ambient outdoor temperature.

2000 A 100% use of gas boiler
1800 B Heat pump + gas boiler
C 100% use of heat pump
Heat consumption (kWh /°C) 1200
1600
1400

1000
800
600
400
B C
200
A
0
-7 0 15 °C

+35% efficiency (space heating) compared to existing condensing gas boiler

Daikin altherma New Existing
hybrid heat pump gas condensing boiler gas condensing boiler

Space heating

Energy supplied by HP 12,800 kWh
Conditions
HP efficiency 3.64 Scop
Energy supplied by gas boiler 6,700 kWh 19,500 kWh 19,500 kWh Heat load 16 kW
Space heating efficiency 90% 90% 75% Design temperature -8°C
Running costs 1,220 € 1,520 € 1,820 € Space heating off temperature 16°C
Maximum water temperature 60°C
DHW HEATING
Minimum water temperature 38°C
Energy supplied by gas boiler* 3,000 kWh 3,000 kWh 3,000 kWh Gas price 0.070 €/kWh
DHW heating efficiency* 90% 80% 65 % Electricity price (day) 0.237 €/kWh
Running costs* 230 € 260 € 320 € Electricity price (night) 0.152 €/kWh
TOTAL Total space heating requirement 19,500 kWh
Running costs 1,450 € 1,780 € 2,140 € Total DHW heating requirement (4 persons) 3,000 kWh

* for combi-boiler, no separate domestic hot water tank

Yearly savings:
for space heating and domestic hot water

-19% versus new gas condensing boiler 330 €/year
-32% versus existing gas condensing boiler 690 €/year

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