Burnham 'Revolution' efficiency numbers

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that boiler runs pretty hot, around 210° as I recall. This is so the VS injection pump can do it's thing and allow @ 70° return temperatures to the boiler.

I'm not sure there is an efficiency chart. Generally the output divided by the input BTU gets you close to the efficiency. I'd guess mid to high 80% is the best you will do with a cast, non condensing boiler.

hot rod

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S. Orbine

Anyone out there know where I might find a chart of efficiency vs. water temperature for a Burnham RV5 ?

Does efficiency go down dramaticall at higher temps?

Unknown

Steve

There are no efficiency charts that I am aware of for this boiler. The nature of the AFUE ratings for the Revolution boiler are based on 140°F system water flowing through the boiler. As Hot Rod stated though, the Revolution has a built-in bypass setup with variable speed injection from the boiler to the bypass and utilizes a 210°F high limit to make it work. This boiler is safe against return water as low as 55°F due to the inner flow control of water through the boiler vessel. There will be no discernable drop in efficiency with higher system water temperatures with this boiler. This boiler can condense in the flue but not in the heat exchanger.

We have taken the Revoultion up one more notch with the Revolution II model. This incorporates a heat recovery unit to exchange even more btu's from the exiting flue gasses to the return water and bumps up the efficiency in excess of 90%. Refer to the link below for more on the Revolution II. Hope this helps.

http://www.burnham.com/residential/revolutionII.cfm

Glenn Stanton

Manager of Training

Burnham Hydronics

www.burnham.com