ᐅ Air Source Heat Pump – Increasing Heating Capacity

Hello everyone.

We have an air-to-water heat pump, a mechanical heat recovery ventilation system, and underfloor heating.
I made a few adjustments to the heating system.
Among others:
- Disconnected the ERR and adjusted the heating optimally.
- Set the heating curve from 4 to 2 (maximum 10).
- Lowered the flow temperature from +40 to 32 degrees Celsius (89°F to 90°F).

After completing these changes, the temperature in all rooms was reasonably comfortable. I then only reduced the flow in the bedroom, increased it in the home office since we suddenly had to work from home, and also raised it slightly in the guest bathroom.

What do you think of this approach in general? Is there anything else that could be optimized?

Now my main question:
After six months, my girlfriend feels the house is generally too cold, although the temperatures remain steady. I think this is mostly psychological due to the weather outside. However, since we are expecting weather starting tomorrow that occurs only about once every ten years here, I want to increase the heating slightly throughout the entire house. How should I best proceed?

Tx-25 schrieb:

My partner generally feels that the house is too cold after six months, even though the temperatures remain stable.

I would also find 18°C (64°F) generally too cold. 😉

Tx-25 schrieb:

Since tomorrow we are expecting weather that occurs here once every 10 years at most, I want to raise the heating slightly throughout the entire house.

Why?

Without further information, nothing can be said about this.

nordanney schrieb:

Why?

To the best of my knowledge, I have set the heating to its minimum output. However, it should still maintain the indoor temperatures we aimed for, which it does. @nordanney you seem to remember our previous conversation or maybe you took a peek 😉

I have to admit my girlfriend is right that it could be a bit warmer. I’m not feeling cold, and she only rarely does, but it’s just not super cozy.

Now to your why: I expect the house to get somewhat colder when it’s -13 degrees Celsius (9°F) outside with stormy gusts, since I’ve reduced the heat pump’s output. I also disconnected the ERR, which normally would push the unit to full power.

Or does everything adjust accordingly?

If I still want it a bit warmer everywhere (also considering the weather forecast for next week), which settings do I need to adjust?

@T_im_Norden: What information do you need? KfW 40 standard insulation on the building envelope, 150 square meters (1,615 square feet), detached house, 1.5 stories, Elco Aerotop Split air-to-water heat pump.

Tx-25 schrieb:

Or does everything just adjust accordingly?

I would simply give it a try. The question is whether the maximum flow temperature you selected is sufficient for the outdoor temperatures. Otherwise, you can adjust the heating curve a bit (steepness) and/or the flow temperature. The flow temperature might need to be set slightly higher than it is now to make it warmer overall.
==> Remote diagnosis 😉

Alternatively, you could move to the Rheinland region. Temperatures below freezing only occurred on a handful of days (and even then, just barely and mostly at night).

Current supply/return temperature
Room temperature in the rooms
Design of the underfloor heating according to the heating engineer
Heating load according to the heating engineer
Number of HVAC units
Number of heating circuits and lengths
Error active or not
Heating circuit settings/flow rate
Buffer tank yes/no
Circulation yes/no
Operating times of the heating system per day in hours and number of starts (please no graphic)
Exact designation of the heat pump

Have you already performed a hydraulic balancing, and if so, what were your numbers before?

A supply temperature of 32°C (90°F) seems too high for a KfW 40 standard.