ᐅ Is it possible to install a gas condensing boiler that meets the KfW 55 energy efficiency standard?

Pumpernickel1 schrieb:

We also chose gas + solar + ventilation to meet KfW 55 standards. Regardless of KfW, we would have chosen this combination anyway. Our municipality extended the gas supply to this new development. Additionally, we did not want an external heat pump exposed to the weather.
Deep drilling is not allowed in our area, so gas was the only remaining solution.

Whether heat pump or gas, opinions differ. Everyone has their view. However, gas should not be completely dismissed here.

Can you say something about the additional cost?
Recently, the general contractor roughly estimated that the triple combination of gas, solar, and ventilation is about 15,000 euros (about $16,000) more expensive than a standalone air-to-water heat pump...

Gerddieter schrieb:

Can you say something about the additional cost?
Recently, the general contractor mentioned without checking precisely that the triple combination of gas, solar, and ventilation is about 15,000 more expensive than the air-to-water heat pump alone...

Solar plus central ventilation with heat recovery costs 15,000, and gas is included in the standard package. The air-to-water heat pump alone costs 16,000 plus 10,000 for ventilation.

Gerddieter schrieb:

I have already looked into that as well. We prefer a gas boiler to avoid having that ugly unit in the garden...
Builder 1 says it won’t work with the KW55 standard and doesn’t do it...
Builder 2 says it works fine if combined with solar thermal, ventilation, and heat recovery, pricing then similar to a heat pump...

But I don’t know what’s correct...
GD

Then get a ground-source heat pump with horizontal collectors (that’s what we are doing). It’s more efficient than an air-to-water heat pump and you don’t have the ugly unit outside. Also, if you install a photovoltaic system, you can power the brine-to-water heat pump with that (except in winter, when less electricity is generated).

Gas keeps getting more expensive. You produce much of your electricity yourself. Even though there is a gas line in front of our property, we decided against a gas boiler. Plus, unless it’s already done, you still need to have the gas line run onto your property. That also costs several thousand euros, have you factored that in?

Unfortunately, we don’t have gas here, so we use an air-to-water heat pump. To set it up properly, you need a lot of time and motivation to research online, or you need a good technician... which is unfortunately very rare.
Gas works, gas heats, gas is cheap.

I just don’t understand what is supposed to be so great about air-to-water heat pumps, UNLESS you have photovoltaic panels as well, but you also need to have the money for that first.