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I think they're both right and both wrong. Pumps generate heat while running, albeit a negligible amount therefore if they are mounted within the shell any heat they lose is lost to the shell. The down side is there is less room for insulation. Any pumps mounted outside of the shell provide more room for insulation but the heated water is circulated outside of the insulated area where it gives up heat. I saw the pump location on their website and neither the pumps or the piping seem to be insulated.
QuoteI think they're both right and both wrong. Pumps generate heat while running, albeit a negligible amount therefore if they are mounted within the shell any heat they lose is lost to the shell. The down side is there is less room for insulation. Any pumps mounted outside of the shell provide more room for insulation but the heated water is circulated outside of the insulated area where it gives up heat. I saw the pump location on their website and neither the pumps or the piping seem to be insulated.Most spa pumps are 50-75% efficient at converting electrical energy into mechanical energy. A single 3hp pump that is 75% efficient, running at full load, will produce about 870W of "waste" heat. That is over 20% of the output of a 4kW heater - not what I'd call "negligible". Of course, the pump isn't necessarily being run 100% of the time, either, so that would affect the total heat produced by the motor.In theory, the Arctic Spas design would be more efficient than a full-foam tub at transferring this waste heat into the water. This is energy that the heater won't need to supply.Regards,Altazi
Who is telling the truth? Help.