JohnnyMX
Gold Member
Simple mechanical timer maybe like for a pool pump (which would assume you have power available or stored to run a low) or a digital timer to a relay or something. I'm not a pro on this stuff but it seems reasonable.
Hi Cam,for your electronic thermostat, can you supply power to it via a battery to keep the brain alive overnight? ( or use an old school thermostat to turn off the heater when it is up to temparture like used an an electric hot water tank). Cam
There's also the issue with solar water heaters failure to perform on cold or windy days or days without direct sun.