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Hi all. I am looking to replace my 1957ish 87,000 btu net load boiler. My house is 1500 sq ft. with a heat loss of 48,254. I am planning to replace windows soon so that number should improve a bit. It is a 1 1/4" one pipe system with 92 feet of baseboard w/3/4" diameter copper fin same era. I went with a minimum 570/ft and calculated 52,720 btu's. I have only lived here a year but ran the boiler at a max of 140 degrees almost all of last year but bumped it up to 160 when the temps were down to -10 -15 a day or two last year. I usually had a 3 to 4 degree delta T using a infra red temp gun. B&G series 100 106189 pump.
I was thinking of putting in a Lochinvar WHB055N even though the 51,000 DOE it is awfully close to the heat loss. Also I was thinking running this as a full flow, single temp system with no zones. Even tho the price for the Lochinvar is pretty steep and way more bells and whistles than I need, it does come with the variable speed pump/control. And setup for my application should easy peasy. My brother is in plumping and heating but has not installed any mod/cons.
1. Do you think this system will work fine and make it into the condensing temps.
2. Is there any reason to replace any of the existing components in the piping system? It has a taco air scoop with a steal expansion tank off the top in the correct position in the system, a taco flo-check and B&G diverter tees.
3. Do I need to flush the system. I do not see any mention of that in the install manual. Just to install a screen in the return line.
Any comments/advice are appreciated. And thanks in advance.