Hello,
in our case (120 sqm (1300 sq ft) living area with underfloor heating, 60 sqm (650 sq ft) basement corridor area with standalone heaters), a 14 kW Wolf gas-solar heating system is planned. We are considering installing standalone heaters in two rooms in the basement, which is fully insulated. However, the plumbing company argues that the 14 kW system is not sufficient and recommends a 20 kW unit.
I find this a bit confusing and believe I have read that oversizing can lead to higher operating costs and increased wear (among other reasons, due to the minimum modulation level).
For now, I have declined this proposal. Presumably, it would make more sense to calculate the actual heating load instead of just "going for it." However, I think increasing the heating capacity just because of two standalone heaters is exaggerated.
Is there anyone in this forum who has an opinion on this?
in our case (120 sqm (1300 sq ft) living area with underfloor heating, 60 sqm (650 sq ft) basement corridor area with standalone heaters), a 14 kW Wolf gas-solar heating system is planned. We are considering installing standalone heaters in two rooms in the basement, which is fully insulated. However, the plumbing company argues that the 14 kW system is not sufficient and recommends a 20 kW unit.
I find this a bit confusing and believe I have read that oversizing can lead to higher operating costs and increased wear (among other reasons, due to the minimum modulation level).
For now, I have declined this proposal. Presumably, it would make more sense to calculate the actual heating load instead of just "going for it." However, I think increasing the heating capacity just because of two standalone heaters is exaggerated.
Is there anyone in this forum who has an opinion on this?
Ötzi Ötztaler schrieb:
And which part of the warranty are you supposed to waive? That the house doesn’t get warm enough, or the entire warranty? Probably the former.
OWLer schrieb:
Is the rest all underfloor heating and only the basement is concerned? If it’s about the radiators and the higher supply temperature needed, you can also install underfloor heating in the basement. Costs would be a heating circuit manifold and a few hundred euros for the pipes plus installation. The rest is all underfloor heating. Yes, it’s only about the basement. A few hundred euros sounds very cheap. I was given estimates by acquaintances in the four-digit range.
Ötzi Ötztaler20 Oct 2020 22:50
So, you might be able to sign to confirm that you accept if the basement does not get properly warm. How warm do you actually want it to be in the basement?
Ötzi Ötztaler schrieb:
So you might be able to sign that you accept if the basement doesn’t get properly warm. How warm do you actually want it to be in the basement?Do you have any suggestions? Warm enough to use a room for several hours in winter without wearing two sweaters... Note: The basement is fully insulated...
I might be repeating myself. But 130sqm (1400 sq ft) of an old building, consistently heated to 22 degrees Celsius (72°F), in the deep winter at -10 degrees Celsius (14°F) outside temperature, shows a measured heating output of 7.5 kW from the gas heating system. With 20 kW, you can heat 4-5 new builds, each with 160sqm (1700 sq ft) of heated area.
Okay, the opinion here in the forum is clear. I told this to the technician, but he insists and is surprised that only 14 kW instead of 20 kW is planned (without the additional radiators), and that even in smaller houses they usually install the 20 kW units. He also sees no problems or additional operating costs with a heating system running at higher (maximum) capacity.
Is this ignorance or simply a genuine concern that they might not be able to ensure proper operation?
Is this ignorance or simply a genuine concern that they might not be able to ensure proper operation?
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