ᐅ Sizing of Air-to-Water Heat Pumps for New Construction

Whether your house with a heat pump operates efficiently depends on the insulation, not on the theoretical annual performance factor of the heat pump.

Mycraft schrieb:

Nonsense, if you shower more or less regularly, nothing will dry out there.

Well ... we don’t have any odor 🙂

Mycraft schrieb:

However, there is a big difference between stepping onto cold or warm tiles when entering the shower.

That almost sounds like you’d freeze without underfloor heating in the shower. Since people usually shower with warm water, I consider this “disadvantage” negligible, especially since our bathroom is at most 20°C (68°F) — even the ladies in the house don’t want it any warmer.

You can clearly notice the difference. Additionally, every square meter of heated floor space in the bathroom is beneficial, even when aiming for 20°C (68°F).

As mentioned earlier, before you start considering a specific model, you should first determine whether your house can be efficiently heated with a heat pump. Underfloor heating combined with two radiators is not ideal.

Mycraft schrieb:

You can clearly tell the difference. Additionally, having heating over every square meter (m²) of floor space in the bathroom isn’t a bad idea, even when aiming for 20 degrees Celsius (68°F).

Then we must be the odd ones… nobody here has missed it so far. However, the shower area would probably dry faster with it. If you have underfloor heating in the shower, I would also recommend adding heating loops to the stairs so that the temperature difference between the floor and the stairs isn’t too extreme. 🙂

T_im_Norden schrieb:

As mentioned before, before you focus on a specific model, you should first determine whether your house can be efficiently heated with a heat pump.
Underfloor heating combined with only two radiators is not ideal.

The radiators are almost never used. One is in the garage and the other one is in the bathroom upstairs, acting more like a “ladder radiator.” About a year ago, we already received an offer for a heat pump combined with solar. That would have cost 50,000 euros plus additional expenses for installation work. Then another expert told me that in 2020 there would be newer, more efficient heat pumps using different refrigerants that could close the efficiency gap with ground-source systems. When I came across the Arotherm plus today, I wondered if it might be such a model. It is also supposed to be suitable for existing buildings with radiators, as it can provide a supply temperature of up to 75 degrees Celsius (167°F).

@T_im_Norden He has to build according to the energy saving regulations, so that means KfW, and even then a heat pump runs efficiently.

Regarding the topic of underfloor heating in the shower, it is necessary for 2-3 seconds until the warm water arrives; after that, it doesn’t matter.