Wren
Member
I'm curious about the best way to install the Grundfos pump that I bought. The outlet of the pump is a 3/4" union fitting while the input has a 3/4" sweat connection.
I'm planning on having the return go back into the water heater through the drain on the bottom after adding a tee and reinstalling the drain bib.
It appears that these pumps are often mounted directly to the water heater output with a union to 3/4" pipe connection, but I couldn't find a pump that was for sale that was configured in that manner, so I'll have to find a sweat to female NPT to thread it onto the WH outlet. Also, I've read that it's better to have the pump at the water heater near the return inlet, but as I mentioned above, I've also seen it mounted directly to the WH on the output nipple.
The pump doesn't have any mounting provisions that I can see so I'm thinking that it should be mounted directly on top of the outlet nipple. I believe that I have enough headroom to do this, but I'll have to mock it up to know for sure. It's going in a crawlspace.
In the photo, one can see that the input (lower inlet) is a sweat connection while the upper is a 3/4" union.
I've also seen these pumps mounted on a tee that's added to the drain nipple, but it seems like it would be easier to put it on the WH output if I can. I'm not certain about how to secure the PEX pipe I'm using against the side of the WH for the return if I put it low on the WH at the level of the drain.
I hope all of this makes sense. Any advice would be appreciated. Thanks!
I'm planning on having the return go back into the water heater through the drain on the bottom after adding a tee and reinstalling the drain bib.
It appears that these pumps are often mounted directly to the water heater output with a union to 3/4" pipe connection, but I couldn't find a pump that was for sale that was configured in that manner, so I'll have to find a sweat to female NPT to thread it onto the WH outlet. Also, I've read that it's better to have the pump at the water heater near the return inlet, but as I mentioned above, I've also seen it mounted directly to the WH on the output nipple.
The pump doesn't have any mounting provisions that I can see so I'm thinking that it should be mounted directly on top of the outlet nipple. I believe that I have enough headroom to do this, but I'll have to mock it up to know for sure. It's going in a crawlspace.
In the photo, one can see that the input (lower inlet) is a sweat connection while the upper is a 3/4" union.
I've also seen these pumps mounted on a tee that's added to the drain nipple, but it seems like it would be easier to put it on the WH output if I can. I'm not certain about how to secure the PEX pipe I'm using against the side of the WH for the return if I put it low on the WH at the level of the drain.
I hope all of this makes sense. Any advice would be appreciated. Thanks!