HandyManDan
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Hi, This spring I plan to tackle a redo of my boiler plumbing, adding some radiant heat in addition to the existing baseboard. The current boiler is a Laars MinithermII -160KBtu model. I was planning on keeping this boiler and replacing a few worn out parts. After doing some study, I know now that the current installation (done before I owned the house) is a total mess - there are 5 zones, one 007 pump on a single loop, no bypass. I replaced the heat exchanger a few years back - no surprise that it failed.
In the redo, I plan to put in a dedicated boiler loop and then run 3 separate loops off of that for hot water, baseboard and radiant.
My question has to do with the bypass recommended for low temp returns - which I will now have with the radiant loop. The Laars docs recommend one of several bypass schemes to route hot water back to the intake for low temp returns. I am thinking that doing the bypass with manually adjustable valves may work OK for the radiant, but then be inefficient for the other loops, since they don't need hot bypass. There is one scheme that uses a mixing valve - see picture attached. Anyone have insight or experience with this way of doing a bypass for low temp return? I know the mixing valve will be pricey since 1.25, but seems like a good way to do this?? Thanks, Dave from Santa Fe, NM
In the redo, I plan to put in a dedicated boiler loop and then run 3 separate loops off of that for hot water, baseboard and radiant.
My question has to do with the bypass recommended for low temp returns - which I will now have with the radiant loop. The Laars docs recommend one of several bypass schemes to route hot water back to the intake for low temp returns. I am thinking that doing the bypass with manually adjustable valves may work OK for the radiant, but then be inefficient for the other loops, since they don't need hot bypass. There is one scheme that uses a mixing valve - see picture attached. Anyone have insight or experience with this way of doing a bypass for low temp return? I know the mixing valve will be pricey since 1.25, but seems like a good way to do this?? Thanks, Dave from Santa Fe, NM