Hey,
we are building a KfW-70 house, which will be powered and heated by an air-to-water heat pump (underfloor heating).
The developer has offered us a so-called “series return storage tank” that is supposed to temporarily store excess energy and release it back into individual rooms as they cool down. If we don’t take this option, we would need to keep a heating circuit open, which can no longer be temperature-controlled, but through which heat continuously flows. Based on experience, this area would then generally be a bit warmer (1-3°C (2-5°F) more than desired).
Is anyone else installing an air heat pump and using such a series return storage tank? What are your experiences with it? Our main concern is whether such a storage tank is energy- and cost-effective, or if it only pays off after a very long time, making it reasonable to skip it.
The model offered to us is the following:
Vaillant compact heating series return storage tank heat pump RS 100 (100 liters (26 gallons)) for 1,356 EUR (incl. VAT).
Thanks in advance for your opinions, and best of luck to everyone with their building projects!
Stephie
we are building a KfW-70 house, which will be powered and heated by an air-to-water heat pump (underfloor heating).
The developer has offered us a so-called “series return storage tank” that is supposed to temporarily store excess energy and release it back into individual rooms as they cool down. If we don’t take this option, we would need to keep a heating circuit open, which can no longer be temperature-controlled, but through which heat continuously flows. Based on experience, this area would then generally be a bit warmer (1-3°C (2-5°F) more than desired).
Is anyone else installing an air heat pump and using such a series return storage tank? What are your experiences with it? Our main concern is whether such a storage tank is energy- and cost-effective, or if it only pays off after a very long time, making it reasonable to skip it.
The model offered to us is the following:
Vaillant compact heating series return storage tank heat pump RS 100 (100 liters (26 gallons)) for 1,356 EUR (incl. VAT).
Thanks in advance for your opinions, and best of luck to everyone with their building projects!
Stephie
Well, a storage tank worsens the energy balance. The problem is when the underfloor heating cannot dissipate the heat because the heating circuits are closed or barely open.
You have to accept a nearly uniform temperature in almost all rooms and as many open circuits as possible. This way, the heat pump can operate at full capacity.
Please keep in mind: A heat pump is not a gas boiler; it works best with as low flow temperatures as possible. To still deliver the required heating output, the surface area must compensate for this. A living pattern like in the 1980s—with night setback, some warm rooms, many cold rooms, and closed doors—is only possible with new heating systems if at all, and only with a loss of efficiency! Good luck with your further planning!
You have to accept a nearly uniform temperature in almost all rooms and as many open circuits as possible. This way, the heat pump can operate at full capacity.
Please keep in mind: A heat pump is not a gas boiler; it works best with as low flow temperatures as possible. To still deliver the required heating output, the surface area must compensate for this. A living pattern like in the 1980s—with night setback, some warm rooms, many cold rooms, and closed doors—is only possible with new heating systems if at all, and only with a loss of efficiency! Good luck with your further planning!
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