Any idea what the difference in water temp was in the water heater at the different settings?
Personally this looks like a successful test to me. What expectations do you have that these results don't meet?
No idea on the temperatures right now. However, my new IR thermometer arrived yesterday.
From that initial test I believe the concept has been proven sound. I guess I'm curious about what fans with 2x the CFM will do. The one new fan arrived in this mornings post. Probably tomorrow I'll do a test measuring water temperature across the radiator a the Low - Medium - High water heater settings. That'll be with the original fan set. Then I'll change the fans and do another set of temperature drop tests.
The temperature controller may arrive in a few days. Or may not. It's a direct China shipment. When that arrives it may be interesting to compare the energy use to maintain the selected temperature with both the low and the higher capacity fans. Or if I can find where the un-used PWM controller is I may try slowing the speed of the higher capacity fans.
But for now I'd say what I have works. Add a temperature controller and it should be viable for any TD and small insulated CT.
I'll be back with temperatures and energy use later. Just can't say when for certain. Then we can all compare results and maybe others can refine the system. All I want is to have some heat without spending the big bucks for something like a Propex. Some other heaters that others have used require wall space we do not want to give up.