ᐅ Underfloor heating with an air-to-water heat pump. House gets too warm when the sun is shining.

Created on: 4 Dec 2019 14:18

Hello everyone,

I have a general question.

We moved into our new build four months ago. The living area on the ground floor has three large floor-to-ceiling windows facing south. We have underfloor heating and an air-to-water heat pump.
It provides a really comfortable temperature inside the house, but we have a problem – whenever the sun is shining in winter, even if it’s -2°C (28°F) outside, the temperature suddenly rises to 24°C (75°F) in the living room. It gets uncomfortably warm in here, and the underfloor heating can’t be turned down quickly.
Should we assume that the large floor-to-ceiling windows are responsible for the heat gain? A photo of the south-facing side of the house is attached.
What would you do – always lower all the blinds as soon as sunlight is forecast? That seems quite annoying...
We have motorized blinds controlled by Somfy. Would you consider buying a sensor that automatically lowers the blinds at a certain temperature?

Thanks in advance for your replies.

Neues zweistöckiges Haus auf Baustelle mit weißer Blockfassade, pinker Dämmung und großen Fenstern

chewbacca1235 Jan 2020 11:15

#355

tomtom79 schrieb:

So now I’ve read the explanation in the Rosa forum about why it’s wrong to operate a heated towel rail. So it’s not about an extended heating surface.

As I understand it, the problem lies with the return flow.

If the heated towel rail is connected to its own heating circuit, it is probably the shortest loop and allows a high return temperature to flow back to the heat pump in the shortest time. This then reduces the flow temperature, which is counterproductive.

Of course, you can throttle it, but never enough to make it beneficial.

Hey, what do you mean by heated towel rail?
Do you really think everything possible has been achieved in our bathroom?

opalau5 Jan 2020 11:16

#356

Towelradiator

chewbacca1235 Jan 2020 11:54

#357

opalau schrieb:

Towel radiator

ah thanks

dab_dab5 Jan 2020 11:57

#358

That is why there is a growing trend towards purely electric towel warmers.

chewbacca1235 Jan 2020 12:08

#359

dab_dab schrieb:

That is why the trend is increasingly moving towards fully electric towel warmers.

We have one like that in the bathroom, fully electric.

Musketier5 Jan 2020 12:09

#360

tomtom79 schrieb:

If the towel radiator is connected to its own heating circuit, this is probably the shortest circuit and will return a high flow-back temperature to the heat pump within the shortest time. This then reduces the flow temperature, which is counterproductive.

However, the flow-back temperature would have to be measured for that. In my heating system, for example, this is not done at all. Could it be that it makes a difference whether the heating system is controlled by the return flow or the flow temperature?

ᐅ Underfloor heating with an air-to-water heat pump. House gets too warm when the sun is shining.

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