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Posted by Mike on September 30, 2005 at 16:51:54:
In Reply to: Re: Boiler/Radiant Advice Needed posted by Joe Brix on September 30, 2005 at 09:02:56:
: No Circ means you have a gravity system. You'll need to get a circ on there for the PEX with a mixing valve to lower the water temp. I'd be worried about a circulator upsetting the flow in the rest of the system. Get a pro out there to take a look.
Right. I understand that I'd have to put in two circulating pumps- one for my existing system of cast iron radiators and the other for the in floor tubes. But the question for me is to whether or not I should change out the 35 year old boiler or modify the existing boiler? Is there going to be that great a gain in efficiency with a new 84% efficient boiler? Right now I have a 135,000 BTU unit v. the contractor recommended 98,000 BTU replacement. So it would seem that my present boiler would have sufficient capability to handle the added load from the radiant tubing. Again, I'm looking for some more honest and objective advice than I may be getting from the contractors who are more than happy to install an entirely new system. Thanks.