Boiler bypass

[Deleted User]

When pumping away, where would you install the boiler bypass and what size bypass piping?

Weezbo

that is a heavy Question ...*~/

or two. the first part i'd say after the pump to the return,ahead of a temp gauge indicative of the mixed water return temp............. the second part well, without being vauge...........the size required to maintain the temp at a set point temperature at the gauge ahead of the valve on the return main header to the boiler.so as to not void the warranty of the boiler or heating plant.

Dan Peel

boiler bypasses

Burnham have good piping detail on boiler bypass setups. Be sure the boiler you are using doesn't have specific flow requirements - then decide between boiler bypass and system bypass. Weezbo's answer refers to system bypass. For boiler bypass you install your bypass with a throttling valve between the boiler and the expansion tank. Sizing is typically full size of primary pipe. Enjoy.....Dan

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Unknown

Boiler Bypass Piping

Here is a drawing depicting a boiler bypass with the pump on the supply. Hope this helps.

Glenn Stanton

Burnham Hydronics

Unknown

Glenn , are the 2 valves

below the bypass absolutely necessary ? By opening the bypass valve , would water choose the path of least resistence , from the return to the supply ? And what size bypass does Burnham recommend on the V8 line ? We typically use 1 inch . Thanks Glenn .

Dave Bush

One size below the S&R??

That's what I was always told, anyway, and have always done it that way...

(Did I just say "always done it that way"????? I'm gonna go flog myself for that remark....)

Unknown

Bypass Piping

Hi Ron,

The valves make sense for isolation for servicing reasons. Really though, only one or the other is neccessary along with the one on the bypass. You would open one and close the other to properly establish the temperatures and flow you are looking for. As far as sizing, one size smaller than your supply and return will usually protect against the worst case scenario. As Weezbo stated below, temperature gauges are also a nice thing to have if you don't happen to own an infrared gun. Hope this helps.

Glenn