04:33AM | 11/13/04
Member Since: 11/12/04
3 lifetime posts
I just replaced the old hot water heater on 11/11 due to the heater was 18 years old, and started leaking. Everything appeared to be working fine on the new heater; About a day after the install, all of the sudden, I have low HOT water pressure, cold pressure is fine? I have checked both gate valves going to the water heater, both are open fully. I had replaced all the galvanized pipes in the house about 6 years ago; I removed the Aerators on all faucets to rule out that they were clogged, still low hot water pressure? Everything was fine before and for a full day after the new heater was put in? I am at a loss as to what could be the problem? I did put 2 new of those flexible copper supply lines on the heater, one of them twisted more than I wanted, but is not fully closed (not even half way). Am I overlooking something, or what could be the problem? Thanks in advance for any help!!



06:21AM | 11/13/04
If all faucets have low hot pressure then it seems likely the problem is in the vicinity of the heater. Gate valves are a problem because the gate comes loose from the stem. The stem can turn and turn but doesn't move the gate. It is possible that after the gate was open it has slipped and partially closed. I don't know why you have two gate valves. Additionally, not all flex connectors are full bore, however you state you did have good pressure for a day.

If you have heat trap nipples one of them may have become partially stuck. I would disconnect the outgoing hot supply and check your pressure there.


06:33AM | 11/13/04
Member Since: 11/12/04
3 lifetime posts
Thanks for the quick response! I forgot to mention that when I replaced the galvanized pipes, I went to copper, and I also installed an extra gate valve near the heater, in case if I had to ever replace it, I could just turn both valves off right there & swap the heater out. When I disconnect the outgoing hot supply, what would be the best way to check the pressure?

Thanks, Rob


06:36AM | 11/13/04
Member Since: 11/12/04
3 lifetime posts
Forgot one more thing, since I installed a gate valve on the hot water side, which it probably really wasn't necessary now that I think about it; would you recommend taking that valve back out?

Thanks again!


07:28AM | 11/13/04
Water expands as it heats and will back up in the water pipes. We used to think that having a valve on each side could potentially create a bomb but now we have heat nipples that do the same thing. I don't see a reason to remove it. lever ball valves are generally maintenance free and last decades. Gate valves sometimes don't even last five years.

To check your pressure attach a pipe to the outgoing flex connector directed towards a bucket. When you do, look up and see if that gate is all the way open. I'm presuming that you replaced the galvanized piping previously. But if it was the same time as the heater then you could have blockage in the hot stems of the faucets.


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