Hello everyone. Our air-to-water heat pump has been in use for about half a year now. We recently noticed some hissing noises coming from the outdoor unit. It sounds similar to a truck brake losing pressure, but somewhat quieter. I have heard this noise three times so far. The last time, I happened to be outside near the outdoor unit. The noise appeared, and the fan stopped running—not suddenly, but gradually. I stood right in front of the unit to see what was happening. After a few seconds, the fan turned on again. At that moment, a kind of "cloud" appeared. Not a real cloud, more like when you blow dust off an old book. It didn’t smell like something burning, but more like intense heat being generated. I hope you understand what I mean. How would you assess this situation? So far, neither the heating system nor the unit has shown any error messages. The heating is working perfectly. Because of the weather, the outdoor unit is practically running almost non-stop. Could this be some kind of overheating that causes the fan to briefly switch off?
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Daniel-Sp7 Jan 2021 11:12Mycraft schrieb:
@Olli-Ka
Yes, it also works if you run the calculations. If you just build something roughly, it obviously won’t work out. Just compare everything side by side: investment, operating costs, etc., and don’t forget the interest rates, then compare over a 20-30 year period. Keep in mind that with a gas boiler you will probably only need one for the entire period, whereas with heat pumps it might be two, or in the worst case three.
So? Modern units no longer need electricity to circulate the refrigerant? But that’s exactly the counterargument of every air conditioning opponent. I wasn’t aware that phase changes in both directions now occur spontaneously.What was meant is that the defrosting is not done purely electrically using power...
untergasse437 Jan 2021 11:17The energy that this device draws from your system must be put back in afterward. In any case, it should already be accounted for in the overall balance. I just hope I can still use our two-year-old Weishaupt super-efficient boiler for a while longer.
Mycraft schrieb:
Yes, it works if you do the calculations. If you build something just by rough estimates, it obviously won’t turn out well. You simply need to compare everything side by side: investment, operating costs, etc., and don’t forget the interest rates—then compare over a period of 20–30 years. Keep in mind that with a gas boiler you’ll probably only need one for the entire period, but with heat pumps, in the worst case, you might need two, maybe even three. Hello,
I should really get more informed about this.
Is the type of heating system already important for the building permit / planning permission, or can it be decided later?
I have an appointment with the architect next week.
In our rented terraced house, there is a very old (22 years) boiler installed. It still works for now, but I expect it could fail any time.
Maybe someone should start a thread comparing heating systems—boiler versus heat pump.
Best regards,
Olli
Olli-Ka schrieb:
Is the type of heating system already important for the building permit/planning permission, or can that be decided later?
I have an appointment with the architect next week. Yes, it is important because the thermal insulation certificate depends on the type of heat generator, and this is part of the application process (timing may vary).
Olli-Ka schrieb:
Maybe someone should start a thread – comparison of heating systems – boiler vs. heat pump. Have a look around the forum, this discussion (or rather a belief war) has, of course, come up more than once 🙂
At the moment, the gas boiler is clearly advantageous purely from a financial perspective. This remains the case even with the CO2 tax for the next 5 years. However, this is not set in stone. It is quite possible that gas prices will be significantly increased due to political decisions. Electricity can be generated independently, disregarding inverse demand patterns and production peaks, whereas gas probably cannot.
R
Rorit20207 Jan 2021 12:37It should also be considered that the heat of crystallization (heat released during freezing) is mostly available to the heat pump. This should be taken into account when evaluating the efficiency...
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