ᐅ Conversion from Gas Boiler to Heat Pump

Hello,

I have a well-insulated KFW40 house from 2014 with underfloor heating and 170m² (1830 ft²) using a Weishaupt gas boiler WTC 15 (heating + hot water).

The gas boiler has two heating circuits. One for the house and the other for the garage. The garage is connected via a district heating pipeline (about 8m (26 ft) from the house). The garage should only be kept frost-free.

My annual gas consumption (heating + hot water) was about 9700 kWh.

I believe my house is well suited for a heat pump. Unfortunately, I wasn’t that knowledgeable back then.

Now my questions.

1. Which type of heat pump would you recommend (ground source or air source)?

2. Where can I install the heat pump? A) Inside the house, where the gas boiler is now, or B) in the garage? Unfortunately, the heat pump could not produce hot water in the garage because there is only a cold water line to the garage. Or are there any solutions? I would prefer the garage otherwise.

I hope you can help.

Thank you.

Before making any renovations here, I would first calculate the investment plus energy consumption over 5–10 years (heat pump) compared to gas.

For KfW40 standard, an air-to-water heat pump (in front of or beside the house) is easily sufficient, unless you live on the Zugspitze.

I want to upgrade now. Therefore, I have a few questions. Can anyone help me?

As my predecessor mentioned, it definitely makes sense to question the purpose and benefits. Simply ignoring the objection does not demonstrate a particular ability to reflect. Buying an air-to-water heat pump without necessity is not only throwing money out the window but also takes away the opportunity from someone who truly needs a higher flow temperature. Regardless of that, you need an air-to-water heat pump of about 5 kW, depending on your heating load calculation. It will be installed and that’s it. What information do you need for that?

I have already asked these questions.

1. Which heat pump would you recommend (ground source or air source)?

2. Where can I install the heat pump? A) inside the house, where the gas boiler is currently located, or B) in the garage? Unfortunately, if installed in the garage, the heat pump cannot produce hot water because only a cold water line runs to the garage. Are there any solutions for this? I would otherwise prefer the garage.

Vwgolfcabrio schrieb:

I already asked the questions.

1. Which heat pump would you recommend (ground source or air source)?

2. Where can I install the heat pump? A) inside the house, where the gas boiler currently is, or B) in the garage? Unfortunately, if installed in the garage, the heat pump cannot produce domestic hot water because only a cold water line runs to the garage. Or are there any options? I would prefer the garage otherwise.

Try googling about your NAT at home. I assume an air-to-water heat pump will easily be sufficient, as already mentioned.
I wouldn’t supply the garage from the heat pump; instead, I’d install a split air conditioning system there. As long as it’s frost-free, that will be enough.
For the heat pump, choose a monobloc system. For the design, you need a heating load calculation.
Judging by the consumption including the garage, a 5kW heat pump will easily suffice.
Also, read up on hydraulic balancing and setting the heating curve, then everything should be fine.
Oh, and with a monobloc you don’t need an indoor unit.