ᐅ Heat pump is not compatible with a hydronic (water-heated) fireplace.
Created on: 20 Oct 2023 18:54
J
Jessica388
Hello everyone,
I hope someone here can help us because our heating engineer doesn’t seem to be able to…
Key data
New build 2022 with 250 m² (2,691 ft²)
Heat pump Viessmann Vitocal 200-A
Multifunction storage tank MFS1000S
Water-heated stove with heating capacity on the water side of 8 kW
Photovoltaic system
Electric heating element
I am attaching the schematic of the storage tank layout.
The stove was initially connected under “old” and now it has been modified.
Everything works fine as long as the underfloor heating is off.
When the underfloor heating is on, our hot water temperature doesn’t exceed about 55°C (131°F).
When the underfloor heating is off, the temperature ranges between 65–75°C (149–167°F), either via the electric heating element during sunshine or by stoking the stove.
Now, however, this energy seems to be wasted. It can’t be that the underfloor heating requires 70°C (158°F) supply temperature to achieve a flow temperature of 35°C (95°F), right? The return water is only slightly cooler. So the water should only need to be heated by a maximum of 5°C (9°F).
We assume either a) something is still connected incorrectly, or b) the cold water from the underfloor heating causes such circulation that the hot water cools down within minutes.
What can be done about this?
Has anyone experienced similar problems?
Normally, we should almost run without electric power, but currently the heat pump switches on almost every hour to heat hot water…
I hope someone here can help us because our heating engineer doesn’t seem to be able to…
Key data
New build 2022 with 250 m² (2,691 ft²)
Heat pump Viessmann Vitocal 200-A
Multifunction storage tank MFS1000S
Water-heated stove with heating capacity on the water side of 8 kW
Photovoltaic system
Electric heating element
I am attaching the schematic of the storage tank layout.
The stove was initially connected under “old” and now it has been modified.
Everything works fine as long as the underfloor heating is off.
When the underfloor heating is on, our hot water temperature doesn’t exceed about 55°C (131°F).
When the underfloor heating is off, the temperature ranges between 65–75°C (149–167°F), either via the electric heating element during sunshine or by stoking the stove.
Now, however, this energy seems to be wasted. It can’t be that the underfloor heating requires 70°C (158°F) supply temperature to achieve a flow temperature of 35°C (95°F), right? The return water is only slightly cooler. So the water should only need to be heated by a maximum of 5°C (9°F).
We assume either a) something is still connected incorrectly, or b) the cold water from the underfloor heating causes such circulation that the hot water cools down within minutes.
What can be done about this?
Has anyone experienced similar problems?
Normally, we should almost run without electric power, but currently the heat pump switches on almost every hour to heat hot water…
R
RotorMotor25 Oct 2023 08:18The components are also simply very imprecise. It’s just a bi-metal that switches on and off.
Therefore, set everything to (for me, except the bedrooms and pantry) and then perform the thermal balancing later via the heating circuit distributor.
Therefore, set everything to (for me, except the bedrooms and pantry) and then perform the thermal balancing later via the heating circuit distributor.
B
Buchsbaum25 Oct 2023 10:10Jessica388 schrieb:
We have set it to 2 in the rooms where we don’t need heating (storage, pantry, bedroom). WilderSueden schrieb:
Our thermostats (Busch-Jäger) adjust in 5-degree steps, so 2 means 10°C (50°F), 4 means 20°C (68°F), and 6 means 30°C (86°F). Sounds like a great heating system.
We were already more advanced than that 50 years ago.
F
Fuchsbau3525 Oct 2023 10:14Jessica388 schrieb:
So unfortunately it’s now too cold in the bathroom (21.5°C (70.7°F)) and also in the living area without a stove…
We would like to have 23-24 degrees in the bathroom.
What should we do now?
Raise the heating curve and target temperature?Do you not have an additional radiator in the bathroom? We were specifically advised to install electric towel warmers because of the floor heating’s slow response time. These can heat up fairly quickly when needed. Even when the heating loops are installed more closely together in the bathroom, that often isn’t enough.
B
Buchsbaum25 Oct 2023 10:30Fuchsbau35 schrieb:
We were specifically advised against underfloor heating because of its inertia, and recommended electric towel radiators instead,Who recommends purely electric supplementary heating? I believe heat pumps are the ultimate solution.
Heating with electricity generated from fossil fuels produces about three times more CO₂ emissions than burning fossil fuels locally in central heating systems.
In that case, you might as well use some old oil-filled radiators during the winter months. Even better if powered by green electricity, making it environmentally friendly. They will keep things comfortably warm when the heat pump can no longer manage.
Buchsbaum schrieb:
Who is recommending purely electric supplementary heating?In our thermal insulation verification, it is an integral part of the calculation. By now, it is no secret that the low supply temperature alone is not sufficient for the bathroom.So it’s not that the bathroom is heated solely by the electric heater...
F
Fuchsbau3525 Oct 2023 10:52Buchsbaum schrieb:
Who actually recommends purely electric supplementary heating? I believe the heat pump is the ultimate solution.
Heating with electricity from fossil fuels produces about three times more CO₂ emissions than burning fossil fuels locally in central heating systems.
In the winter months, you might as well put a few old oil-filled radiators in your home. Even more environmentally friendly if powered by green electricity. They will keep things cozy warm when the heat pump can no longer manage.Do you really understand how a underfloor heating system works? Are you aware that a heat pump also uses some electricity? And who says we’re using electricity from fossil fuels?
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