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proposed HW heating system
Thinking about a hw heating system for a friend who may be installing a new system in a ranch house near the shore which was damaged by the storm.
He wants to put the boiler in the attic and downfeed the baseboard in leiu of his old system which used a crawl space for the mains and had the bolier in a utiliy room on the main floor which is roughly 1500 sq. ft. and has three bedrooms, a living rm, dining rm and one bathroom.
I was wondering if I could run a hw heating system using two- one pipe circuits that twined the returns together when it got back in the attic. In other words, run two supplys downfeeding from the boiler in the attic and wrapping around the one-level ranch with two loops and then back up into the attic where they would twin together in a common return to the boiler.
I was considering using TRV's in each room with a by-pass (one size smaller) around the fintube) for controlling the temperature in the rooms while maintaining flow.
One circulator, on the supply (pumping away) and two flow control valves(one per circuit) and a reset controller was what I was thinking. Does this plan make sense? Will I be able to balance this system easily? Should I use circuit setters on the returns or should I put the TRVs on the return instead? With the feeder and the comp. tank just before the pump on the supply off the boiler will I be Ok with air removal?
Finally, can a system like this use a Condensing Boiler? The fuel here is natural gas and my friend wants to install an instantaneous hw heater up in the attic as well.
I appreciate any comments and input. This is all in the planning stages right now as he is awaiting decisions on insurance. The home is right off the beach in the Jersey shore area.