Thought about building one to preheat water to the hot water heater.
Thought about flattening the copper tubes some for more area, but otherwise build it standard, insulated box w/ interior painted black, double glazing (have old sliding glass door)
The questions
If our demand isn't high, won't it need to be built w/ a recirculating pump and a preholding tank for the water to heat up any instead of on minimal demand?
Thought about an insulated door to close over it, manually or auto and a heating coil in case of freezing, what kind of cheapee coil?
Haven't seen the advances in them, now a lot of glass tubing w/ copper tubes in them in a vacuum.
Thought about flattening the copper tubes some for more area, but otherwise build it standard, insulated box w/ interior painted black, double glazing (have old sliding glass door)
The questions
If our demand isn't high, won't it need to be built w/ a recirculating pump and a preholding tank for the water to heat up any instead of on minimal demand?
Thought about an insulated door to close over it, manually or auto and a heating coil in case of freezing, what kind of cheapee coil?
Haven't seen the advances in them, now a lot of glass tubing w/ copper tubes in them in a vacuum.