Selection of a heating system

Hello dear home builders,

I am still quite new to this forum. It’s hard to believe why, but we also want to build our own home and hope for your advice :). At the moment, we are still fully in the idea-finding and planning phase (please move the thread if it belongs in another topic).

We are planning a bungalow of about 190 sqm without an upper floor and basement. The house should meet an energy-saving standard KW. Our builder uses lightweight timber construction. So far, so good. Now I am looking for the suitable heating system. I have already read a bit about it, but have not gone too much into detail yet, as everything is still in the planning phase.

I would like to install a complete system with bivalent or hybrid operation. As the main heating system, I am thinking of a gas/oil boiler (still clarifying whether gas is available on the property – advice on which is more suitable is welcome). The transmitter would be underfloor heating in dry installation, hopefully with ceramic tiles/laminate. As a heating supplement, I would very much like to install a water-bearing fireplace that feeds the water into a combined buffer storage tank (question: what size is advisable for a later 4-person household). Additionally, I want to integrate a solar thermal system of about 6 sqm south-facing for hot water support.

The most decisive question probably is, does anyone have a similar complete system and can tell me something about the installation costs? Also, I would be interested in the economic aspect, i.e., is the extra effort even worthwhile?

Finally, a rather secondary question:

If I were to integrate a rainwater harvesting system into the system? Does that make sense? Here I would also be interested in the cost/benefit question.

I hope you could follow my rambling thoughts a bit and can give me some good advice.

Thank you very much in advance

Hello,

the first question is how much energy you need for heating and hot water. Here, the creation of a heating load calculation would be the appropriate basis. Based on that, you can consider what proportion can be covered by your main heating system and what additional benefit the water-bearing fireplace has. This will also lead you to the first economic considerations.

At the same time, you could also consider whether there is potential for improvement in the thermal quality of your building.

Once the basics are clarified, you can further deal with the details of the heating systems.

And if gas is available, I would rather recommend a gas condensing boiler than an oil heating system.

Best regards, Erik