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General Outdoor Furnace Discussion / Re: danger involved with OWB overheating?

« on: August 21, 2013, 09:24:13 PM »

Thanks for the reply Scott. Because my detached garage heater, the house furnace, and the domestic water are all heated from my Hot water heater, and the week of -40 degree weather in the winter I didn't think the plate heat exchanger set up as hot water on demand would work. I figured if we weren't using water for showers, clothes, etc.... the water in the tank would cool from circulating to the different heaters? I looked at a side arm but from reading this forum was afraid that it wouldn't be able to handle the load? I found the attached schematic on this or another forum, and decided to try it. What do you think?

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General Outdoor Furnace Discussion / Re: danger involved with OWB overheating?

« on: August 21, 2013, 02:11:33 PM »

Thank you for your replies. I am using a flat plate heat exchanger however I believe it is doing more than pre-heating the water.  The way I Plumbed it is from the drain port on the HWH the line runs to the circulation pump to a check valve through the heat exchanger and to an extra port on top of the HWH. the circulation pump runs constantly. Is there any danger in "boiling" with this set up? Thanks

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General Outdoor Furnace Discussion / danger involved with OWB overheating?

« on: August 21, 2013, 01:29:47 AM »

I plumbed my CB OWB into my Hot Water Heater using a plate heat exchanger. I am using a circulation pump to keep the water continuously mixed. My question is what will happen with the water in the HWH if my boiler overheats? will it also boil? will it blow the pressure relief valve? What is the worst case, and how can I mitigate it. Thank you for any input.