Air-to-air vs. air-to-water heat pump KFW55 house - cooling function important

2023-07-05 09:28:53

In my opinion, with an air-to-water heat pump, it is always just a "software update" or rather simply a license key. Each manufacturer/heating engineer then sets the licensing models individually. Whether it is one or two devices initially has nothing to do with that.

2023-07-05 09:33:29

I think the tail is wagging the dog here. Whether one device or two is a matter of taste. Personally, I would prefer to have two devices and be able to replace them independently. Then you look into the cooling issue.

2023-07-05 09:42:19

Okay interesting, that’s how the consultant explained it to us in the selection area. But we only have these two heating systems to choose from - maybe the key costs more with Viessmann. What is the keyword for the cooling - I would check directly with the two models at the manufacturer.

2023-07-05 09:44:32

I would personally prefer to have two devices and be able to replace them independently.

Small example from reality. Our solar installer in the old house (probably) caused a short circuit during the installation of the photovoltaic system. This damaged the circulation pump in the heat pump. We didn’t notice anything until the day after moving in when we realized the house was quite cold. Customer service couldn’t fix it, the manufacturer’s customer service had to handle it. They could be there as soon as possible after 3 days. We bridged those 3 days with heating from the air conditioning. Expensive as hell but better than freezing in a cold house with a small baby.

2023-07-05 10:25:41

Since my plumber is still on vacation this week, I looked it up on the internet. Maybe someone here has the same heat pump and can confirm the information for me. In advance, we are having a Vaillant VWL 75/6 installed. Air-to-water heat pump with underfloor heating. According to my research, to activate the cooling function, you only need the appropriate coding resistor (costs around 30-60€) and that is supposedly all. I quote ChatGPT, as it summarized my entire research very well:

To install the coding resistor, you must first disconnect the heat pump or the hydraulic station from the power supply. Then you need to remove the cover of the heat pump or the hydraulic station. Next, you have to insert the coding resistor into the designated socket or terminal. The exact location of the socket or terminal depends on your model. You can refer to the quick guide for installers. After installing the coding resistor, you must put the cover back on and turn on the heat pump or the hydraulic station. Then you can activate the cooling function via the control panel or the remote control. Please note that the installation of the coding resistor may only be carried out by a qualified professional. If you are unsure how to install the coding resistor, please contact a Vaillant service partner near you. I hope this guide was helpful for you. If you need further assistance, please let me know.

2023-07-05 10:42:00

According to my research, you only need the appropriate coding resistor to activate the cooling function.

That was also my understanding, so I was surprised by the cost. I will probably be at our construction site again tomorrow. My plan is to ask the plumber (from the general contractor) if I can order it and if he can simply install it. Let’s see what he says, whether he would need to do anything else for it. If I get the right one, he is actually a fairly competent, goal-oriented guy.

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Air-to-air vs. air-to-water heat pump KFW55 house - cooling function important

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