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Thanks for the replies! I do want to heat my domestic HW with the OWB. Stephen, what kind of controller can relay the command for the pump to turn on through the thermostat. What do you have?

Hello, I'm looking for help on how to set up my system. I have a circulator for the boiler and a small pump for the heat exchanger (water heater side to plate exchanger). I will be hooking up the furnace to a fan coil and again, the water heater to an exchanger. The fan coil will be on the...

Thanks for the welcome and reply iCreek! I think you've said enough when the "hot" is cold to the touch. One other factor may be the connection to the water heater and whether it's connected from the bottom drain to the pressure relief valve port. Maybe it would thermosiphon then? How's...

Hello All, I'm new here and looking for advice. When I hook up my OWB to the plate exchanger (not tube!) which is ultimately connected to the hot water heater. Will it thermosiphon effectively or will I need a pump? (to circulate the water heater side) Some folks say it will thermosiphon OK...

Here's the scoop, (according to questions I have asked of the pro's!) You need a full flow fitting to maximize your BTU's gained. A full flow fitting would be a wirsbo expander type fitting. It is an expensive tool but I'm sure a plumber could hook you up. If you can't find that, a sharkbite...

I will soon have the same issues! Can I steal your thread and ask: When the OWB is on, (water was cool so aquastat opened damper) what causes the water to circulate in the water heater for the actual heat transfer? My guess would be to hook up a small pump from the bottom of the tank to the...