Postby OLBC Group » Mon Jul 11, 2022 11:20 am
You cannot expect a back garden stand alone hot tub to perform like a fully fitted unit with a plant room.
You do need a proper filter and dosing system to keep the water clean, get the scum off the top of it and not end up with soup like water.
You can make heating them cheaper using a heat pump, or connect them to the central heating circuit, but as @uptheoctave has rightly stated the heat losses are substantial however you slice and dice it.
£1,700 seems extraordinary for a heating bill for month - that is as much as my whole gas bill was last year for a 5 bed victorian house even at present crazy prices - it must have been almost totally uninsulated to achieve that level of heat loss!
Even emptying and refilling the hot tub with fresh water, frequently, is going to be quite expensive.