Hello dear homebuilding community,
We are currently considering building a house.
The construction company offers, at no additional cost, either a gas condensing boiler or an air source heat pump (Rotex hpsu compact 304 with 4 kW).
The house would have 130 sqm (1400 sq ft) of living space over 1.5 floors, with underfloor heating on both levels, for a household of two adults and one child who only lives in the house occasionally.
Do you have any advice for us?
Thank you very much in advance!
We are currently considering building a house.
The construction company offers, at no additional cost, either a gas condensing boiler or an air source heat pump (Rotex hpsu compact 304 with 4 kW).
The house would have 130 sqm (1400 sq ft) of living space over 1.5 floors, with underfloor heating on both levels, for a household of two adults and one child who only lives in the house occasionally.
Do you have any advice for us?
Thank you very much in advance!
B
Bieber081515 Feb 2017 11:38Nordlys schrieb:
Hmm, then the gas boiler is too expensive. It should actually be clearly cheaper than the heat pump. Yes and no, it was the same for us. The standard from the developer was a Rotex HPSU Compact (air-to-water heat pump). In the case of a gas boiler, you would first calculate the gas connection and then—due to the lack of a creative energy expert—add solar thermal on top. For us, in the specific situation, the air-to-water heat pump was cheaper than a gas condensing boiler. (The gas option was not developed in detail!)
In other scenarios, it can be different. At least you should not forget the cost of the gas connection when doing the calculations…
When considering gas, clarify upfront whether the connection will be an additional cost and if solar thermal is included. Also, the chimney, which is only required because of the gas installation if no stove is desired, adds to the cost and at least affects the building’s appearance.
An air-to-water heat pump is suitable. The one mentioned is rather small at 4 kW (4.3 hp); typically, larger heat generators are used. I would recommend sizing the heat pump based on a heat load calculation to be provided. Only then can the correct dimensioning be achieved. If the heat pump is undersized, there is an increased risk that the electric heating element will need to be used frequently, leading to higher operating costs.
An air-to-water heat pump is suitable. The one mentioned is rather small at 4 kW (4.3 hp); typically, larger heat generators are used. I would recommend sizing the heat pump based on a heat load calculation to be provided. Only then can the correct dimensioning be achieved. If the heat pump is undersized, there is an increased risk that the electric heating element will need to be used frequently, leading to higher operating costs.
Alex85 schrieb:
Also, the chimney costs money as well, which is only needed because of the gas Isn’t that just a small plastic "exhaust pipe"?
RobsonMKK schrieb:
Isn't that just a small plastic "exhaust pipe"?In our rented single-family house, a special aluminum chimney was installed when it was converted to gas. Although the house has a masonry flue, it is located elsewhere and therefore inaccessible.
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