ᐅ New Build – Gas Heating and Mechanical Ventilation with Heat Recovery – Without Solar?

markus2703 schrieb:
For gas without solar plus a controlled ventilation system, you will need a well-insulated exterior wall to comply with the energy saving regulations.

Only a professional can calculate that. What is the reason against solar? It is probably cheaper than complex insulation.

The arguments against solar thermal are, first, a relatively unfavorable cost-to-yield ratio, and second, the fact that about half of all solar thermal systems stop functioning properly or cease to work altogether after some time. Homeowners often do not notice this and usually skip professional inspection and maintenance. I have around 20 years of professional experience in this field... Very good thermal insulation of the building—unless overpriced—will save energy costs in the long term.

Thank you very much for your replies and opinions. I have contacted our architect.

If others have experience or opinions on the subject, I would appreciate it if you could share them with me.

A few days ago, I had an initial consultation with a general contractor (GC). I was basically thinking along the same lines as the original poster, as I thought the energy saving regulations would be sufficient. I also had in mind that this would generally be cheaper than an air-to-water heat pump. However, the GC said that nowadays a heat pump is overall more cost-effective than gas plus solar. That confused me a bit, and unfortunately, I can’t really judge whether this is true or just sales tactics. I’ll see what other providers have to say about it.

That depends: A good heat pump from a reputable brand like Junkers or Viessmann is considerably more expensive than a high-efficiency gas boiler from the same manufacturers plus two solar panels on the roof. However, you still have to pay for the gas connection, which would be unnecessary with an air-to-water heat pump. Check the price of the gas connection with your gas supplier. Here, it is extremely cheap at around 700 (all inclusive).

When calculating operating costs, a lot depends on assumptions about gas and electricity prices. This is always somewhat uncertain. The fact is: an air-to-water heat pump significantly increases electricity consumption. After all, you are no longer buying gas. But the system includes an electric compressor and an electric heating element for cold nights. In contrast, a gas heating system uses very little electricity for its control technology. Joedreck knows more details. Contact him. Karsten