coal boiler tied to oil boiler piping

Al Letellier_9

You should contact the manufacturers to get the necessary info on the proper way to hook them up. typically they are piped to allow flow through both boilers, especially if the oil boiler has a coil for domestic hot water.

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JC from PA

Tying coal hot water boiler into existig oil hot water boiler

Does anyone have any suggestions on what to do and what not to do? It's a Memco coal boiler and a New Yorker oil fired. I could parallel or put them in series. Your thoughts?

Thanks!

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I'd look into

a primary secondary. Same as I would oil/ wood or oil/ electric or any other dual combo. This assures proper flow through each, keeps them hydraulicly seperate, keeps the off line boiler cool.

Al brings up a good point about a HW coil. I suppost an aquastat could trigger the oil boiler circ and allow heat from the primary loop and the coal boiler to heat the oil boiler. Sort of an indirect boiler/ DHW source.

hot rod

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Guy_6

Valves

I would do a primary/secondary arrangement with motorized valves (I can't call them zone valves any longer, as they do so much more)on the supply pipes. Have a simple aquastat on each boiler open the proper valve whenever that particular boiler reaches a set temperature. whatever boiler is heating will supply the loop, without unloading any of the heat into the off unit.