Dear all,
I am currently facing a delivery issue with my heat pump (Vaillant Arotherm Plus VWL 75/6), which is not available from any dealer and according to the manufacturer will likely only be delivered in calendar week 6 of 2022. With winter approaching and my heating technician now using his instantaneous water heater at another customer’s place, the situation is becoming quite problematic. He is offering me a 5 kW (kilowatt) fan heater as a temporary solution, but I’m concerned that this will lead to very high energy costs.
For this reason, I have come up with the idea of getting a readily available monoblock heat pump to use just as a temporary measure until my Vaillant arrives. There seems to be a Panasonic model (probably from the series of the well-known and widely recommended “Geisha”) which appears to be suitable and is available at a reasonable price (around 3500 EUR). I would then resell it afterwards.
However, since the market for used heat pumps is rather small, I wonder whether this will really be cheaper than heating electrically with direct heating for three months. I have roughly calculated that in the worst case, I would have to expect heating costs of 2500-3000 EUR with electric direct heating (depending on extent and weather conditions).
Does anyone here have experience with this?
@Benutzer200, if I remember correctly, you once installed a Panasonic unit? Did you happen to sell it later on?
Well, I hope someone has faced a similar problem and can share their experience.
Kind regards
Tolentino
I am currently facing a delivery issue with my heat pump (Vaillant Arotherm Plus VWL 75/6), which is not available from any dealer and according to the manufacturer will likely only be delivered in calendar week 6 of 2022. With winter approaching and my heating technician now using his instantaneous water heater at another customer’s place, the situation is becoming quite problematic. He is offering me a 5 kW (kilowatt) fan heater as a temporary solution, but I’m concerned that this will lead to very high energy costs.
For this reason, I have come up with the idea of getting a readily available monoblock heat pump to use just as a temporary measure until my Vaillant arrives. There seems to be a Panasonic model (probably from the series of the well-known and widely recommended “Geisha”) which appears to be suitable and is available at a reasonable price (around 3500 EUR). I would then resell it afterwards.
However, since the market for used heat pumps is rather small, I wonder whether this will really be cheaper than heating electrically with direct heating for three months. I have roughly calculated that in the worst case, I would have to expect heating costs of 2500-3000 EUR with electric direct heating (depending on extent and weather conditions).
Does anyone here have experience with this?
@Benutzer200, if I remember correctly, you once installed a Panasonic unit? Did you happen to sell it later on?
Well, I hope someone has faced a similar problem and can share their experience.
Kind regards
Tolentino
I keep my air-source heat pump running continuously at 22°C (72°F). Starting in April, I lower it to 15°C (59°F). This way, it turns off automatically and only heats the domestic hot water once a day (when the sun is shining). I have found this to be the optimal setting for us. Currently, I have an indoor temperature of around 22-23°C (72-73°F) with outdoor temperatures between 0-4°C (32-39°F). When the sun shines more strongly during the day, the interior heats up further due to the large window areas, and the underfloor heating adjusts accordingly on its own. Naturally, the air-source heat pump uses less energy then.
Benutzer200 schrieb:
The heating stays off during the day even when using just the heating curve. I’ve been operating this way for many years now (first with a brine heat pump and now with an air-to-water heat pump). The heating system detects from the return temperature—which stays warm because the house remains heated—that no output is needed. Currently, the heating is off between 11 a.m. and 5 p.m., even in the old building 😉 . So the result is the same, just achieved differently. At night, the outside temperature drops, so the return temperature setpoint increases. The heat pump then supplies heat that is actually not needed. Generally, I would avoid running air-to-water heat pumps unnecessarily at night, since the heat source is usually colder then than during the day. ;-)
B
Benutzer2004 Mar 2022 18:29guckuck2 schrieb:
At night, the supply temperature drops, so the return target increases. The heat pump then produces heat that is not actually needed. Since the house should not cool down, the heat is necessary. In a new build, the heat demand is manageable. Therefore, the heat pump can simply run at low capacity continuously. This is efficient.
guckuck2 schrieb:
In general, I would try not to run air-to-water heat pumps unnecessarily at night because the heat source is usually colder than during the day ;-). Sure, it’s also colder outside at night 😉 . But it’s better to run at low capacity than to push hard in the morning. That’s neither truly efficient nor gentle on the equipment.
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