ᐅ Is it possible to have gas heating without solar panels in a new build?
Created on: 1 May 2022 16:22
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derFriese
We are currently planning our new build and struggling with the heating system. The living area of the house is about 165 m² (1776 ft²) plus a heated basement that is rarely used. The house features KfW40-level insulation, controlled mechanical ventilation, and underfloor heating.
Originally, we wanted to install a heat pump, but the prices for heat pumps are outrageous. Even with rising gas prices (electricity prices have also increased), we wouldn’t be able to recoup the initial investment (the additional cost for an air heat pump compared to gas from various builders is around €15,000-20,000). Therefore, we are planning to go with gas heating, with the option to switch to a heat pump later on.
The KfW40 subsidy is no longer available, and I am wondering if it is possible to install a gas condensing boiler without solar thermal panels under the building energy law, given that we already have good insulation and controlled mechanical ventilation. The idea is to save costs and leave more room for photovoltaic panels in the future. Does anyone have experience with this?
Originally, we wanted to install a heat pump, but the prices for heat pumps are outrageous. Even with rising gas prices (electricity prices have also increased), we wouldn’t be able to recoup the initial investment (the additional cost for an air heat pump compared to gas from various builders is around €15,000-20,000). Therefore, we are planning to go with gas heating, with the option to switch to a heat pump later on.
The KfW40 subsidy is no longer available, and I am wondering if it is possible to install a gas condensing boiler without solar thermal panels under the building energy law, given that we already have good insulation and controlled mechanical ventilation. The idea is to save costs and leave more room for photovoltaic panels in the future. Does anyone have experience with this?
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Deliverer1 May 2022 20:26derFriese schrieb:
Offer includes Tecalor THZ 504 air source heat pump (combined unit with controlled residential ventilation) I only took a quick look: Does it have 8 kW? That would be too much for a new build. Half that capacity should be enough.
And if controlled residential ventilation is included, you can deduct around 15,000 from the price. You would need that separately with a gas system as well.
None of this is about “paying off.” No one knows if there will be enough gas next winter. Right now, it’s all very uncertain. So forget the ecological hype, think of the children, and work together with your heating engineer to find a heat pump that matches your heating load.
You’re right about the ERR — you can skip those with gas as well. But better not omit the buffer.
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derFriese1 May 2022 21:43Deliverer schrieb:
And if a controlled residential ventilation system is included, you can deduct another 15,000 from the price. You need that separately with gas as well.I had accounted for the additional costs of controlled residential ventilation with gas.Option 1
Air source heat pump + controlled residential ventilation: Tecalor THZ 504 + €36,800 (compared to gas)
Option 2
Gas: Wolf CSZ (included)
Controlled residential ventilation: Tecalor TVZ 180: + €17,600
Calculation (current prices from Check24 as of today):
- Heat demand = 12,000 kWh per year
- Gas: approximately €1,800 per year
- Electricity (annual performance factor: 4): 12,000 kWh / 4 = 3,000 kWh => €1,214
- Difference: €586 per year
W
WilderSueden1 May 2022 22:38How do you arrive at a demand of 12,000 kWh? As a KfW40 house, it should be around 4,000 kWh (about 1,300,000 BTU) for heating. You are unlikely to reach 8,000 kWh (about 27,300,000 BTU) for hot water; it would more likely be around 2,500 kWh (about 8,550,000 BTU).
What about the option of using two units instead of one expensive device?
What about the option of using two units instead of one expensive device?
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Deliverer1 May 2022 22:52derFriese schrieb:
I had already accounted for the additional costs of controlled residential ventilation with gas. Then the prices are just crazy. Sorry.
What if you just have two heating pipes installed in front of the house and connect the heat pump yourself? There are plenty of instructions available; it’s not difficult. That would roughly cost the same as the gas heating system.
I know it’s some effort. But for $15,000, the hourly rate can be quite reasonable. :-)
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derFriese2 May 2022 00:02WilderSueden schrieb:
How do you arrive at a demand of 12,000 kWh? A house built to KfW40 standard should have a heating demand of around 4,000 kWh (and about 8,000 kWh for hot water seems unlikely; it would be closer to 2,500 kWh).Do you mean 4,000 kWh gas (and thus 1,000 kWh electricity)? That would be too low, wouldn’t it? I just checked the consumption data in the heat pump database again. Sure, there are people who use less. In the end, it doesn’t make much difference anyway (gas consumption would then be lower as well).Deliverer schrieb:
Then the prices are just crazy. Sorry.
What if you simply have two heating pipes installed outside the house and connect a heat pump yourself? There are plenty of guides, it’s not difficult. The cost would be roughly the same as a gas heating system.
I know, this involves some effort. But for $15,000, the hourly wage could be great. 🙂My plan is to start with gas heating but have everything prepared for a heat pump (underfloor heating designed for low supply temperature). The nonsense is that new builds don’t qualify for subsidies, but existing buildings do when switching from gas to heat pump. I know it’s ridiculous, but €20,000 is not a small amount for us (especially as construction prices are generally skyrocketing right now).Similar topics