Crack o matic

Empire_2

I've seen pool heaters like that. Can't remember the brand though.

Mike T.

Jeff Elston

no good

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Dave_4

JE

Is that a Laars JvS?? Probably running too low return temps.

Empire_2

JE

I've seen pool heaters like that. Can't remember the brand though.

Mike T.

Home Depot Employee

Ouch!

A copper tube boiler without a functioning flow switch!

Joannie_14

Not necessarily flow related

Look at the green stuff on the copper. That's looks like low return water temps to me. Plugs up the space between the fins, blocks the flue gases, starts to soot on top of that, and overheats the exchanger.