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Keep your panels for heating hot water only. Unless you want to completely cover your roof with panels(which you can't) then you would be wasting your time and money. You would have to put in a large buffer to satisfy your downstairs UFH heating load and this would be a waste of money.
Remember that it rains a little bit in this country and cloudy skies can't heat much water for washing let alone heating.
Install a condensing oil fired boiler, 200 litre cylinder, a hot water circuit, 2 panels, an downstairs underfloor circuit(if you choose, not my choice) and an upstairs radiator circuit and finally insulate. People are wasting glutinous amounts of money on systems they don't need!!
The hot water requirements of a solar water heating system really depend on the number of people living in the house, and the way hot water is used. Showers use less than baths, and if there is a dishwasher, you'll use less than if there isn't. Also, the design of the system will depend on a number of factors such as the direction of the roof, and whether the house is occupied during the day (more water used, but usually smaller cylinder required), whether there is hard or soft water (hard water causes limescale so you tend to store a larger amount of water at a lower temparature) etc.Hi Villa,
Would what you have outlined above be sifficient for a house approx. 3k sq ft?
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