ᐅ Hybrid heating system: Is combining a heat pump with a gas condensing boiler a practical solution for renovating older homes?
Created on: 19 Mar 2022 08:25
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taskyyyHello everyone,
In a detached house with an attached garage and 145 m² (1560 ft²) of living space, there is still an oil heating system installed, which now needs to be replaced.
Does it even make sense to install a heat pump combined with gas in an old building with poor insulation? Or would it be more practical to just install a gas boiler? Will the heat pump actually "kick in"? Or will the gas boiler always be the only active unit?
The advantage of the combination would be the higher subsidy. A subsidy for gas is only possible if solar thermal is installed, but that doesn’t seem very practical, right?
Does anyone have experience with this combination? What would you recommend? Or would it be better to first fully insulate and then simply install a heat pump?
The energy consultant I had, who is also certified by KFW, seemed totally unsure. Maybe someone here has a rough idea?
In a detached house with an attached garage and 145 m² (1560 ft²) of living space, there is still an oil heating system installed, which now needs to be replaced.
- The heating load is approximately 15 kW.
- The façade has a U-value of 0.97 W/m²K and double-glazed thermal insulation windows are installed.
- The roof is insulated.
- The top floor ceiling is insulated with 10 cm (4 inches) of mineral wool.
- Moreover, the house is fully basemented and the basement ceiling is insulated.
Does it even make sense to install a heat pump combined with gas in an old building with poor insulation? Or would it be more practical to just install a gas boiler? Will the heat pump actually "kick in"? Or will the gas boiler always be the only active unit?
The advantage of the combination would be the higher subsidy. A subsidy for gas is only possible if solar thermal is installed, but that doesn’t seem very practical, right?
Does anyone have experience with this combination? What would you recommend? Or would it be better to first fully insulate and then simply install a heat pump?
The energy consultant I had, who is also certified by KFW, seemed totally unsure. Maybe someone here has a rough idea?
CC35BS38 schrieb:
I wouldn’t install two new heating systems. You have to buy and maintain both, etc. I would also avoid solar unless the subsidies are very high. A heat pump alone isn’t really practical for the heating load, as far as I know. So, better just gas then.
hanse987 schrieb:
Underfloor heating or radiators? If underfloor heating, what pipe spacing? If radiators, which type? No underfloor heating yet, but with a heat pump, at least one would be installed downstairs, so the type and pipe spacing could be planned accordingly, right?
I would skip the gas heating; we are already dependent enough on the madman in Moscow. Even if things calm down politically, it will probably never be the same economically. I would generally avoid fossil fuels.
If a combination is considered, then perhaps pellets or something similar, if it fits.
Personally, I would rather try to invest more in insulation and sealing and rely solely on a heat pump.
The heating load also seems very high to me, considering you have already done some work. Or is the house very large?
If a combination is considered, then perhaps pellets or something similar, if it fits.
Personally, I would rather try to invest more in insulation and sealing and rely solely on a heat pump.
The heating load also seems very high to me, considering you have already done some work. Or is the house very large?
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