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:
Insist on a room-specific heating load calculation according to DIN xxxYou can also commission this online from an engineering firm – it costs about 300€ (approximately 320 USD). My heating installer didn’t want to do it, and so far we’ve agreed that I’ll handle it myself and they will implement the result as part of my own contribution.
Ötzi Ötztaler schrieb:
Insist on a room-specific heat load calculation according to DIN xxxSince this is an additional service for me (new radiators), the company probably will not do it. You could have the pipes pre-installed and then connect them yourself afterwards.
OWLer schrieb:
What is it about exactly? New build/extension/renovation?
Are the basement rooms already finished? New build, the basement rooms are structurally complete, yes. As described in the first post, it’s about two new radiators, which is why the company wants to increase the heating capacity. If I don’t have them installed, the capacity will remain the same.
Ötzi Ötztaler20 Oct 2020 22:15
And which part of the warranty are you supposed to waive? The part about the house not getting warm enough, or the entire warranty?
Is the rest all underfloor heating and is it only about the basement? If it’s about the radiators and the higher flow temperature required, you can also install underfloor heating in the basement. The costs would be the manifold and a few hundred euros for the pipes plus installation.
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