If you want to save some money, and a little time, and desire to have hot water for a low demand bathroom (like in a shop or barn) and your in-floor heat, this layout can work for you.
This heat exchanger has to be outside the tank because the domestic side has too much pressure for our fittings.
It will require a rib relay to control the pump.
And the easier flowing the check valve is, the better.
This one is good, but must be mounted horizontally.
Any questions? Our tech team would love to talk about your project.