I have a 110v spa pump that is itself controlled (on/off) by an air switch. I want to install a spa heater that is 220v, but when I purchased the heater I didn't realize that the heater should only come on when the pump is on. In other words, if there is no power to the pump then there is no power to the heater. I have been told that it MAY be possible to control the 220v heater (with it's own dedicated 220v curcuit) with the power from the 110v pump. How can this be done???
Although the truelly correct answer may be to get a 110v heater to pair with my 110v pump, I like the idea of having the lower operating costs associated with using 220v. Am I on track? Or could a flow switch be used instead so that when the pump is off, it will "lock out" the heater? If so, is there any need for a t-stat? Seems like, no.