Experiences with brine heat pump

2020-05-08 20:38:32

Yes, frequent water changes are indeed the best method against Legionella.

Why does this favor the efficiency of the heat pump? If I have a 260-liter tank warmed up, it stays warm longer than a 180-liter one because there is much more mass to maintain. And if I only use 160 liters from the 260 liters, the new 100 liters are easily warmed by the remaining 160 liters. The 180-liter tank is empty and I have to warm completely fresh/cold water from "0 to 100." Or am I forgetting something?

I am looking for a brine-water heat pump that can be controlled together with a controlled residential ventilation system. Because then the controlled residential ventilation system is also subsidized by BAFA. So far, in my research, only Alpha Innotec/Nibe has come up on the screen, which offers joint control of the heat pump + controlled residential ventilation (with enthalpy heat exchanger), so that the controlled residential ventilation and all accessories are also subsidized by BAFA. Are you aware of anything else?

(It has disadvantages too; if the heat pump control fails, I can no longer control the controlled residential ventilation either, but in my opinion the price advantage outweighs this.)

2020-05-09 00:37:48

I am looking for a ground-source heat pump that can be controlled together with a controlled residential ventilation system. Because then the controlled residential ventilation system is also subsidized by the BAFA. So far, in my research, only Alpha Innotec/NIBE has come up on my screen, offering joint control of the heat pump + controlled residential ventilation (with enthalpy heat exchanger), so that the controlled residential ventilation and all accessories are also subsidized by the BAFA. Do you know of anything else?

Stiebel Eltron also offers a combination. Additionally, there are statements here and in the pink forum that devices linked via KNX are also subsidized by the BAFA.

We ultimately decided on the package from Nibe. Mainly because of the technical specifications of the heat pump, as it has a very low volume flow and can therefore perfectly charge a stratified storage tank for a fresh water station.

2020-05-09 09:34:03

Okay, thanks. Can Stiebel Eltron be recommended just like NIBE?

With a layered storage tank, you basically have a kind of buffer tank, but you can actually do without one with a brine-water heat pump / should do (screed serves as storage). Because a fresh water station with a heat pump without a buffer tank is not useful, right?

2020-05-09 15:03:32

Yes, frequent water changes are the best remedy against legionella.

Why is that beneficial to the efficiency of the heat pump? If I have a 260-liter tank heated, it stays warm longer than a 180-liter one because there is much more mass to retain the heat. And if I only consume 160 liters from the 260, the new 100 liters are easily warmed by the remaining 160 liters. The 180-liter tank is empty, and I have to heat completely fresh/cold water from "0 to 100." Or am I forgetting something here?

I am looking for a brine-water heat pump that can be controlled together with a controlled residential ventilation system. Because then the controlled residential ventilation system is also subsidized by BAFA. So far, in my research, only Alpha Innotec/NIBE has come up on my screen that offers joint control of the heat pump + controlled residential ventilation (with an enthalpy heat exchanger), so that the controlled residential ventilation and all accessories are also subsidized by BAFA. Do you know of anything else?

(It also has disadvantages; if the control of the heat pump fails, I can no longer control the controlled residential ventilation either, but in my opinion, the price advantage outweighs that.)

Which model from NIBE (heat pump + controlled residential ventilation) is that?

2020-05-09 17:20:23

There are several types and possible configurations. The controlled residential ventilation is connected to the heat pump (there are still two separate devices) and the control unit of the heat pump controls both devices. This is supported by BAFA and you can include the controlled residential ventilation along with ducts and such. The condition is, of course, the common control. See

2020-05-10 15:01:21

that was not meant as an attack / criticism
I am just doing a lot of reading myself here in the forum during my planning phase, and it is usually recommended not to install a buffer tank with a heat pump anymore because the screed mass of the underfloor heating is considered as a buffer.

Of course, you can do it however you like. Maybe there are also certain reasons why you consciously decided on a stratified tank. Probably the fresh water station, which is not really useful without a buffer tank with a heat pump, right?

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Experiences with brine heat pump

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