Renew/replace electric heating, no gas connection available

Hello,
We have a single-family house in the family that we want to renovate and rent out.
We want to make 2 apartments of about 65-70m2 each out of the house.
At the moment, the house is still heated by an electric heating system (flat radiators).
Our concern is that even if we update the electric heating to the latest standard, the heating costs will still be very high and this will deter tenants.
We want to keep the costs economical during the renovation, of course. The conversion to gas would of course be very expensive since there is no gas connection available.
We would therefore need everything new from the gas connection to the radiator.
Is such an investment worthwhile? The costs are difficult to recoup through the rent.
But on the other hand, it would increase the property value.
Best regards
Stefan

Low heating costs are also beneficial for the [rental agreement].

So what options remain?

Gas
Oil
Electricity
Electricity (heat pump)
Wood

I can't think of much more.

If it shouldn't remain with electricity (understandable), everything in the house has to be renewed anyway.

And then gas could be the most economical option in comparison. Maybe pellets would also be interesting.

Wood involves manual effort, for an economical heat pump, insulation might be needed on the walls and in the roof.

Ultimately, it's a matter of calculation.

Gas also works with a gas tank if there is no connection in the municipality.

Hello,

Economically, converting to gas will of course be very expensive since there is no gas connection available.

As already mentioned, there is the option of a gas tank. We had a freestanding tank in the garden for over 20 years until a line was finally laid in the village 15 years ago. What we had to consider back then were certain distance rules from the dome (the tank had a cover on top under which the connections etc. were housed) to shafts or cellars and to flammable materials; as far as I remember, this was up to 5 meters depending on the condition. That costs space. The tank trucks also didn’t have particularly long hoses, so it was placed quite close to the street. The tank was rented. There were also underground tanks, but they were half buried. The TÜV regularly came for inspection (IIRC back then every 2 years), and the tank was replaced after 10 years. Your possible gas supplier can tell you more. The gas boiler also had to get a nozzle set suitable for liquefied gas.

The keyword for the search engine of your least distrust could be "installation of liquefied gas tanks." While the costs are manageable, the conversion to a water-based heating system is the more critical part. You will always have that when you want to move away from surface radiators. Pellets, in turn, require sufficient storage space since it makes sense to work with automatic filling. Oil could be quite an alternative due to the simpler tank situation.

Kermit