ᐅ Old gas heating system broken – need a new one, but what kind?
Created on: 11 Feb 2020 07:34
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Nissandriver
Good morning,
we bought a house that was built in 1936 and renovated in 2013.
Last year we viewed it and decided to buy it. Considering that the heating system dates back to 1997, we thought we would need to replace it “soon.”
House: approximately 145m² (1,560 sq ft) of living space, insulated roof, thick exterior walls. Double-glazed windows, chimney in the living room.
The chimney sweep wanted to shut it down two weeks ago because there was a strong smell of gas in the basement. Since we keep the windows open downstairs and have two small children, he decided against it. On his recommendation, we should get a new heating system because repairing the current one would be a waste of money.
We have now had four different heating companies inspect the house. The discussion came up (because I wanted to explore alternatives):
Since we currently have a 27kW (36 hp) instantaneous water heater in the basement for hot water, the question is whether that should be removed and the new heating system used to heat the water as well.
We are planning to install a 10 kWp photovoltaic system on the roof anyway.
I know this is a personal decision, but I would like to become a bit more independent from fossil fuels.
I hope you can help me a little!
Best regards
we bought a house that was built in 1936 and renovated in 2013.
Last year we viewed it and decided to buy it. Considering that the heating system dates back to 1997, we thought we would need to replace it “soon.”
House: approximately 145m² (1,560 sq ft) of living space, insulated roof, thick exterior walls. Double-glazed windows, chimney in the living room.
The chimney sweep wanted to shut it down two weeks ago because there was a strong smell of gas in the basement. Since we keep the windows open downstairs and have two small children, he decided against it. On his recommendation, we should get a new heating system because repairing the current one would be a waste of money.
We have now had four different heating companies inspect the house. The discussion came up (because I wanted to explore alternatives):
- Gas condensing boiler – a gas connection is available, it would be cheaper but is not subsidized (due to CO2 taxes, depending on gas prices).
- Pellet heating – mixed opinions – one expert said it wouldn’t work in the basement due to high humidity (another specialist said that’s nonsense) – higher initial costs – pellet prices are similar to gas prices and it is subsidized up to 35%.
- Log wood stove – high initial cost, needs to be refueled by hand regularly – no clear information on subsidies.
- Air-to-water heat pump – subsidized, the heating specialist took measurements of every single room including ceiling height to calculate the heat demand for the whole house and size the heat pump accordingly. He said he has good experience with it – but electricity prices will rise… it would also need a higher seasonal performance factor to be worthwhile.
Since we currently have a 27kW (36 hp) instantaneous water heater in the basement for hot water, the question is whether that should be removed and the new heating system used to heat the water as well.
We are planning to install a 10 kWp photovoltaic system on the roof anyway.
I know this is a personal decision, but I would like to become a bit more independent from fossil fuels.
I hope you can help me a little!
Best regards
N
Nissandriver11 Feb 2020 10:14halmi schrieb:
That sounds quite questionable... without underfloor heating, gas will probably be the only practical option.
Maybe have someone calculate the costs for an air-to-water heat pump combined with new low-temperature radiators — including any available subsidies. But it’s best to get a quote for the air-to-water heat pump from a different company. I plan to visit another local heating company today or tomorrow for a second opinion.
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nordanney11 Feb 2020 10:19Nissandriver schrieb:
I calculated that we are currently using about 110m³ of gas per dayThat's roughly $50 in heating costs. Per DAY!!! Besides the problem that the gas is leaking somewhere. You better turn off the heating and rent an apartment through AirBnB or elsewhere before your house fills up with gas.
T
T_im_Norden11 Feb 2020 10:31Is this a multi-page certificate, and from when is it?
It should also include information about the energy condition and recommended renovations.
It should also include information about the energy condition and recommended renovations.
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Nissandriver11 Feb 2020 10:35nordanney schrieb:
That’s an easy 50€ heating cost. Per DAY!!! Besides the issue that the gas is leaking somewhere.
You’d better turn off the heating and rent an apartment via AirBnB or elsewhere before your house fills up with gas. That’s true. As I said, I’m on top of it...
T_im_Norden schrieb:
Is that a multi-page certificate and from when is it?
It should also include information about the energy condition and recommended renovations. Yes, it’s a multi-page certificate dated 30.08.2019.
Recommended renovations:
- Heating (central heating with a condensing combi boiler (natural gas))
- Hot water (central hot water supply via solar system (solar energy) + heating system with condensing combi boiler (natural gas))
T
T_im_Norden11 Feb 2020 10:37Just found the pictures you posted.
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T_im_Norden11 Feb 2020 10:49I found the uploaded certificate.
If I calculated correctly, for 180 m2 (1937 sq ft) of usable floor area, you should have an annual consumption of 36,180 kWh.
This corresponds to approximately 3,618 cm3 (cubic meters) of gas per year.
A rough estimate suggests the consumption in January was around 650 m3 (cubic meters).
If I calculated correctly, for 180 m2 (1937 sq ft) of usable floor area, you should have an annual consumption of 36,180 kWh.
This corresponds to approximately 3,618 cm3 (cubic meters) of gas per year.
A rough estimate suggests the consumption in January was around 650 m3 (cubic meters).
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