Mod/Con pump location

Plumbob

Pressure sensor. Pumping away from it could potentially trip it. Otherwise it makes no difference, as you said. Just be sure to use P/S pumping.

Rich L.

why pump in?

I'm seeing most of the mod/ con boiler piping schematics calling for the pump to be mounted on the return, pumping into the boiler. I was told this was to insure adequate flow, low mass, yada, yada. I don't get it. Isn't my rate of flow going to be the same through out my system? Can it change depending on which side of the boiler it's mounted on? I know I'll have pressure drop as my water circulates about, but can my flow rate change also? I don't see how. Maybe I'm missing something obvious...

Thanks for the help!
Still Learnin'

Boilerpro_3

Most mod cons

are high head designs so in order to keep the water from flashing into steam in the boiler you have to pump into the boiler. I generally think this is a waste of energy, since you have to pay to operate a much larger energy hog pump. Some mod coms are low pressure drop, like the Triangle Tube Prestige and Dunkirks, so they can be pumped away with a much smaller, less wasteful pump.

boilerpro

hr

The boiler likes to see

that pressure boost that the discharge side of the circ provides. It keeps the pressure switches "made" also.

Seems more and more of the Mod-cons are getting ported out HXers, and run fine with typical off the shelf 80 watt circs. The Knight, Prestiage, Bobcat to name a few.

Actually copper tube boilers have been showing pumps on the return for 20 years or more, that I know of. It's not a new or unusual concept.

hot rod

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