Garage heating. What is the best / cheapest solution?

Hello,

we are planning to build a house soon. There will be a gas condensing boiler in this house. Next to the house, there will be a large garage (approx. 100m² floor area). I would like to keep the garage frost-free and occasionally heat my workshop to 15-17 degrees in winter. What is the best and most cost-effective way to achieve this? Is it sensible to connect it to the gas condensing boiler? The buildings are exactly 5m apart.

Regards, Fabian

Can no one help me or which forum could give me advice?

That depends on how long you want to work there. Does the entire garage need to be heated or just a small room inside.

Besides that, even without heating you won’t have temperatures below zero degrees in a closed garage.

The hot water would have to be routed outside for a bit and must definitely be well insulated.

Maybe an electric heater would be sufficient there?

The garage will of course have several rooms. The heated room is about 50m². A workshop is to be created here that I can also heat up occasionally (2-3 times a week). The supply line would be carried out underground with the water line. But what is cheapest here? Should I connect the whole thing to the existing gas boiler or maybe use electric heaters? The connection to the gas boiler would probably be best since it is already there. Is underfloor heating better then or panel radiators (due to low temperature)?

That depends on the insulation of the room. The worse the insulation, the more heating energy you need.

If you have underfloor heating in the house, underfloor heating is the only option in the garage as well, unless you install a second heating circuit with a higher flow temperature for a regular radiator.

Or just the electric heating.

What is cheapest in the end can surely be told to you by your heating installer.

The heating engineer wants to install regular radiators for me. However, since I have a low-temperature system, they will hardly be sufficient to heat up, and then they will just stand around in the room and I won’t be able to place anything in that spot.