external tankless

kevin coppinger_4

Of updating a dinosaur heating system. It has a very old W-Mcl boiler that is set up as a tankless but uses a Everhot EA-50 (10 gal./min)external tankless coil as a domestic heater....If I was to replace the boiler and use an indirect what would the comparable indirect be boiler(s) would be 2gph oil fired....ty, kpc

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Ken_40

Kevin,

Your inquiry is a tad confusing. You refer to an output (in GPM of output) with BTU input, with storage, with GPM (presumably of oil in GPH) and look for a suggestion?

Here's my read. You are replacing the boiler with a comparable size unit (which of course implies you have done a heat load calculation and KNOW the replacement unit will be almost identical to the existing?) Given the vastl improved efficiency of new boilers vs. old, this in and of itself seems to require a down sizing but then...

The new boiler would likely NOT be fitted with a TC, nor should it be IMO. The boiler will see zone(s). One for an I/W/H (indirect water heater) and one (or more) for the house heating zone. The concept of having the boiler fire less frequently, but run for longer periods of time is a known efficiency booster. Design basis # 1 being to never run out of hot water, coupled with design basis # 2; to get the hot water as cheaply as possible; suggests larger storage and a boiler that is sized purely on the heat load of the home. Of huge benefit is a timer that allows the I/W/H to "call" for boiler firing, ONLY when the I/W/H reserve would likely be challenged - and NOT at 3 in the morning when no one takes showers.

Make sense?

kevin coppinger_4

thanks Ken....



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