Gas heating + solar & controlled residential ventilation or air-water heat pump Energy Saving Ordinance 2016

Just read one sentence further [emoji4]

I did, I just didn't realize those were supposed to be the reasons.[emoji4] It sounded more like an addition to other, weightier, technical reasons, hence the follow-up. [emoji6]

Has the decision from the topic starter already been made?

We are currently having a lot of difficulty deciding between gas+solar and air-to-water heat pump.

Both options have several pros and cons that cannot be ignored. At the beginning, the tendency was clearly towards the air-to-water heat pump - meanwhile, there are almost too many points speaking against it.

Both variants have several advantages and disadvantages that cannot be denied. At the beginning, the tendency was clearly towards air-water heat pumps - meanwhile there are almost too many points speaking against it.

Out of interest: which ones would those be for you?

In addition to the higher purchase price, we are particularly concerned about the noise from the outdoor unit.

If we want to place the fan properly, we have to set it up about 10m away from the utility room. This also means extra effort. If the two adjacent plots are built on in the future, I don’t know if the 50-60 dB could cause problems. Even with soundproofing, which costs an extra €2,000, there are still about 30 dB left. We have looked at/listened to reference units – it’s not really bad but also not pleasant.

Since the alternative geothermal heat no longer fits into the budget, we feel like we are getting "neither fish nor fowl."

We have chosen a good insulation package and high-quality windows, so the underfloor heating should not have a very high gas consumption. For hot water, there would be 5 sqm of solar panels on the roof.

Overall, we feel that for the extra effort and additional costs, we simply have to make too many compromises.

No, we have not yet made a final decision on which heating system we want to choose, but we want to make a decision by next week. I am also aware that both offers can still be improved, but of course this is associated with higher investments, and there are limits to this even for us.

A house built with a timber frame construction actually has lower sound insulation than a comparable solid house, or am I no longer up to date with the state of the art?

The underfloor heating in offer 1 is of course also feasible, it would just cost about €7000-9000 more according to our general contractor. However, I have also already considered this option.

I have also contacted the manufacturer Bartl by phone. The 800l storage tank apparently consists of a 190l boiler and a 610l buffer tank. This buffer tank is intended to serve only the air-water heat pump.

@ Lobster: In that case, an indoor air-water heat pump might also be the better choice for you compared to the split unit. That would at least solve the problem with the loud fan and the aesthetics from the outside.

What are your thoughts for and/or against it?

We should make a decision next weekend. Normally, I am uncomplicated about such things, weigh the decision, and then stand by it. Admittedly, I am finding it difficult right now with gas+solar or air-water heat pump.

Whether gas will still be up-to-date in many years is questionable. Solar panels on the roof also bother me because of the less-than-optimal positioning in our case. The overall concept of the air-water heat pump in the offered scope and the resulting additional costs only convince us to a limited extent.

We had actually already decided until the topic of the air-water heat pump came up again, and now we are making life difficult for ourselves.