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[pops69]

I have put 4 Taco 10 pumps on my 2840 in the last 3 years. The first two I bought had 2 year warranties the second 2 were not warrantied because they replaced the first. All purchased from Supply House. Anyone had any similar issues? Not sure whats going wrong, pump is in the basement. Any suggestions, or any suggestions on a different pump.

[slimjim]

Move the circ to the back of the boiler and on the supply side, pushing away from the boiler, I would assume that you are starving your supply side of your circ

[RSI]

Why are you using that model pump?

[mlappin]

Move the circ to the back of the boiler and on the supply side, pushing away from the boiler, I would assume that you are starving your supply side of your circ

Exactly, you don’t even have to hear the cavitation it can still be happening though.

[hondaracer2oo4]

People forget that open systems do not pressurize the return line back to the inlet side of the pump. In a closed system you can theoretically put the pump anywhere( I know some places are better than others because of air traps) because the pump is just spinning the water around in a circle. In an open system atmospheric pressure has to push water to the pump. If it can't push it faster than the pump is rated to move than the pump will starve for water on the intake side, cavitate and destroy itself.

[E Yoder]

In any system pumping away from the expansion tank or vent pipe at the beginning of the loop reduces cavitation risk and air bleeds out easier. Dan Holahan has several excellent books on that for anyone interested.
I agree, in open systems this becomes more critical.

[wreckit87]

I see it hasn't yet been mentioned. but I recently found out that the lower taps on the BL series are to be the supply. They aren't labeled, and the manual I looked at shows the top nipples as the supply but some were having steaming issues when piped that way. Otherwise I concur that the pump should be at the boiler vs the basement. If you have a considerable drop in elevation (>10ft)to the pump location to create some pressure on the inlet side of the pump, it can work but they tend to work better at the boiler.

[pops69]

Manual reads bottom is supply, I have read on other posts the top is supply. Anyone know which is right? I have the bottom as supply. Thanks for everyones help and input.

[mlappin]

I’d stick with bottom as supply, should give better mixing in the boiler if nothing else.