We are planning a new build. The footprint of the house: 10 x 14.5 meters (33 x 48 feet). Ground floor: a household of two retirees. Upstairs, a self-contained apartment for one person.
Heating options / power supply:
a) standard gas boiler
b) ground source heat pump, electricity from the grid
c) ground source heat pump, electricity from own photovoltaic system and possibly battery storage
d) ground source heat pump, electricity from own photovoltaic system, battery storage, and possibly cloud services
So far, we have no information about the price difference between purchasing a standard gas boiler and a ground source heat pump.
Two construction companies said a standard, affordable gas heating system would be sufficient since houses today are so well insulated that the heating demand is not very high. But is that future-proof?
And if a heat pump is chosen, is it better to have electricity supplied from an own photovoltaic system? With or without storage? In addition, a cloud solution?
Heating options / power supply:
a) standard gas boiler
b) ground source heat pump, electricity from the grid
c) ground source heat pump, electricity from own photovoltaic system and possibly battery storage
d) ground source heat pump, electricity from own photovoltaic system, battery storage, and possibly cloud services
So far, we have no information about the price difference between purchasing a standard gas boiler and a ground source heat pump.
Two construction companies said a standard, affordable gas heating system would be sufficient since houses today are so well insulated that the heating demand is not very high. But is that future-proof?
And if a heat pump is chosen, is it better to have electricity supplied from an own photovoltaic system? With or without storage? In addition, a cloud solution?
N
nordanney18 Dec 2019 12:01Lumpi_LE schrieb:
There simply isn’t any long-term experience yet.Heat pumps have actually been in use for about 100 years, and nearly 50 years in private homes. So it’s a well-established basic technology that has naturally become extremely popular over the last 10-20 years.nordanney schrieb:
which of course have become enormously popular in the last 10-20 yearsI think it’s closer to 10 years, as before that there simply wasn’t enough material for large-scale studiesL
ludwig88sta18 Dec 2019 12:16That is true in this respect: the gas boiler is simply fully matured, unlike the heat pump, which has only become popular in recent years.
Nordlys schrieb:
We received very contradictory advice. Our heating installer, a subcontractor of the general contractor, wanted to sell the Junkers air-to-water heat pump and praised it highly. However, the general contractor himself recommended a gas boiler, because in his opinion, the pumps are more prone to faults and defects, require replacement sooner, and don’t last as long. He said, based on practical experience, a gas boiler usually runs for about 15 years mostly without problems, which air-to-water heat pumps don’t match.
So, being conservative, we chose gas. K. The recommendation usually favors the option that can generate good profits and where the installer has experience.
Why would someone offer a monobloc heat pump for €2500 (about $2700) when they can sell gas systems or a more expensive heat pump for €5000–15,000 (about $5400–16,200)?
I’m installing one myself in the new build because several of our friends have already had very good experiences with the Geisha.
And at that affordable price, if it breaks down in 10 years, I can buy another Geisha and still come out ahead.
L
ludwig88sta18 Dec 2019 12:22@hegi___ so you will be installing the newer "WH-MDC05H3E5" model as well?
Because I’m currently looking at the specs of this heat pump. It says "Operating range down to -20°C ( -4°F)". What happens if the temperature drops lower than that? Does this mean that below -20°C ( -4°F) the electric heater kicks in and you are basically heating 1:1 with electricity, or how does it work?
Because I’m currently looking at the specs of this heat pump. It says "Operating range down to -20°C ( -4°F)". What happens if the temperature drops lower than that? Does this mean that below -20°C ( -4°F) the electric heater kicks in and you are basically heating 1:1 with electricity, or how does it work?
ludwig88sta schrieb:
@hegi___ So you will also be installing the newer "WH-MDC05H3E5"?
Because I'm currently looking at the data for this heat pump. It says "operating range down to -20°C ( -4°F)." What actually happens if it gets colder than that? Does it mean that below -20°C ( -4°F) the electric heating element switches on and you basically heat 1:1 with electricity, or how does it work? Yes, I will be installing that model as well.
The electric heating element turns on starting at the bivalence point. This depends on the load and the mode of operation, usually between about -5°C and -9°C (23°F and 16°F).
Overall, the heat pump should not be used below -20°C ( -4°F). But for us, temperatures that low are quite unlikely.
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