If your fish house is in your garage or adjacent to the house, and you have gas or oil fired central heating, then why not put in a radiator? I would not recommend running the central heating just to heat the fish house. But in the winter months you will be heating the house anyway. So the fish house will be heated for free! If you are thinking about using this method there are a couple of things to think about;
- The fish house needs to be fairly close to the boiler or another radiator.
- You should always get a quote from a good plumber before doing any work so you can see if it will be worth doing.
- Make sure you have got enough space in the fish house. Radiators need to be attached to a spare wall and cannot be free standing.
- You will need to have back up heating for when the central heating isn’t on.

If you do get a radiator installed make sure you keep a close eye on the temperature of the fish room and turn the radiator down if nessesary. You may have a room thermostat in the house but fish rooms are usually small, enclosed, and well insulated. So the temperature can rise very quickly when the radiator is on! Personally, I would keep the radiator set quite low to just provide some free background heat. You will be suprised how much difference it can make on a cold winter night!