Hot tub heating

[huntedheads]

I know someone is heating there hot tub with thermal panels in the summer. I run a closed loop antifreeze system (Ohio) and I want to add it in-line some way. Maybe just a ball valve open in summer and closed in winter so I still heat my house water too. But how to control the temp. A flat plate exchanger will work but then how to control temp? Differential tied to some kind of electric valve? How are you doing it? Show me some pictures.

[jonas302]

you could do it manually of course(:

One way would be you would have a taco pump running on the hot tub side of the plate exchanger hooked to a relay and a thermostat made for the water or does your hot tub already have a pump? then you would use a zone valve to bypass the exchanger when the thermostat was satisfied

You would find zone valves in the heating section they are used with radiators in the house