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Utica MCB200HID Efficiency
Greetings,
We inherited this boiler when we bought our house. Can anyone help me figure out how (in)efficient it is?
We have a 3500 ft rancher in Maryland which is heated with a combination of baseboard, radiators and a recent retrofit of PEX under the main living area floors.
Thanks.

We inherited this boiler when we bought our house. Can anyone help me figure out how (in)efficient it is?
We have a 3500 ft rancher in Maryland which is heated with a combination of baseboard, radiators and a recent retrofit of PEX under the main living area floors.
Thanks.

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Comments
Be sure you get someone out at least yearly to clean and tune it up, though.
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
The IBR is 71.5%, I believe that includes all losses including standby, jacket and piping.
To complicate things a bit more, it is way oversized for you home which wastes more energy.
For comparison purposes, your real efficiency is probably in the 73%-76% range. A new properly sized mod/con boiler would be around 88% efficient.
Albert Einstein
@MrBob , what kind of aquastat relay (main control, located at the right rear, below where the hot water leaves the boiler) is on that boiler? If it's the Honeywell unit, it would be worth upgrading to a HydroStat or AquaSmart unit to better manage its energy usage and add low-water cutoff capability. Current boilers in this model series come with the HydroStat.
And, the stack damper needs to be operating properly to keep the boiler from cooling down too fast after it shuts off.
Where in MD are you located? We're in Baltimore and stock both HydroStats and replacement stack damper parts.
"Reducing our country's energy consumption, one system at a time"
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Baltimore, MD (USA) and consulting anywhere.
https://heatinghelp.com/find-a-contractor/detail/all-steamed-up-inc