Plan is, too make a lid but Im not too sure on how the best method of insulating the lid is.Do you have a lid and how are you filtering, as this would effect the best heater type?
Ok sounds good. In theory, I need to heat the water in the filter several times over rather than heat the quantity of water in the pond right? Or do I need say 3000w for a 3000 litre pond?I used celotex board sandwiched between polycarb sheets for my lid, helped with temp so much well worth doing. I also insulated the sides and base of pond with insulation board. I tried one of the online pond heaters but didn't find them as good as normal tank heaters, I keep my heaters in the filter as the water then passes over them which I find gives better results.
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Ok, as a different angle of thinking. In theory, how could I heat the room?Well I'm heating 2000 litres with 30th heaters but I also heat the room
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Sounds like a good idea. So I heat the air inside the shed which also heats the pond. The insulation keeps the shed warm.Many oppurtunities. Portable heater, normal radiator.. what I think would be practical would be good insulation - thermostat to keep constant temp.