hot water update.
The pump works great, actually, a little too well. I need to install a restriction on the heating coils to slow the water down so it absorb more of the heat.
I set up the system just shy of full last night and started a fire in the stove.(didn’t need one, but hey, ) 30 gallons of water in the tank with the system primed up, the water level just below the outlet pipes as I don’t have the rest of the plumbing in place yet. I ran into one problem early on and that was an air pocket in the heating coils. The steam built up enough pressure that the pump was not able to force it through. A little suction on the outlet pulled that through and the whole shebang started running smoothly. This leaves me with some trepidation on how well this is going to work.
But to finish where I started, the system ran all night but the water temps never rose above 80 degrees in the tank. Part of that is the long run to the stove (needs insulated as does the tank itself) and I feel that the heating coils are just flowing too fast to pick up the heat efficiently. It would likely work better pumping up to a solar collector as the head would slow the flow down quite a bit.
Any other ideas? Thinking I can make a better set of coils with smaller diameter pipe embedded in an aluminum casting. Add in a restriction on the inlet side of the coil, with full flow out, and it would effectively become a one way valve of sorts.(and I am likely wrong and make my vapor lock issue worse LOL) Another point to alleviate the vapor lock is to re-run all the plumbing so that it all runs on an even plain instead of traversing this big “U” shape between points. This is the joy of getting completely off grid, all the experimenting and learning curves involved. Yeah, I make mistakes, but I never forget them.