New hot water heater installed, but no hot water pressure. Plenty of cold water?

speedball1 · Sep 7, 2007, 10:57 AM

You say you removed the heat trap nipples and connected directly through copper? That would be my first concern. If the heat trap nipples are still connected then remove them and see if that dorsn't help. If you've connected directly and can't get hot water through the faucets then I would suspect that you've disturbed minerals built up on the pipe walls and not they're in the hot water system clogging up the hot water inlet ports in the faucets cartridges. Check and let me know. Good luck, Tom

T-N-T Plumbing · Sep 7, 2007, 03:34 PM

No, I was talking about the 3/4 galvinized threaded nipples that make the connection from
The incoming pipes into the top of the heater. They screw into the top of the heater into the incoming and outgoing ports and where they connect to the copper you have a 3/4 female connector. What I removed before installing the heater was the small rubber pieces that the heater company puts into the holes to prevent trash from getting into the heater during transport, unpacking, etc. I hope this helps clear the situation up.

Thanks again!

iamgrowler · Sep 7, 2007, 04:32 PM

Quote:

Originally Posted by T-N-T Plumbing

No, I was talking about the 3/4 galvinized threaded nipples that make the connection from
The incoming pipes into the top of the heater. They screw into the top of the heater into the incoming and outgoing ports and where they connect to the copper you have a 3/4 female connector. What I removed before installing the heater was the small rubber pieces that the heater company puts into the holes to prevent trash from getting into the heater during transport, unpacking, etc. I hope this helps clear the situation up.

Thanks again!

Were the nipples just plain run of the mill galvanized nipples, or were they heat trap or dialectric nipples?

T-N-T Plumbing · Sep 7, 2007, 07:08 PM

Yep, just plain galvanized 3/4 nipples.

iamgrowler · Sep 8, 2007, 08:10 AM

Quote:

Originally Posted by T-N-T Plumbing

Yep, just plain galvanized 3/4 nipples.

If the problem is prevalent in the entire hot water system and not simply at a single outlet, I would start at the dip tube on the cold water side of the tank and work backwards from there.

It's a possibility, albeit a remote one, that you misaligned the dip tube when you pulled out the rubber plugs and then crushed the opening of the dip tube when you installed the nipples.

speedball1 · Sep 8, 2007, 10:32 AM

"If the problem is prevalent in the entire hot water system and not simply at a single outlet, I would start at the dip tube on the cold water side of the tank and work backwards from there. It's a possibility, albeit a remote one, that you misaligned the dip tube when you pulled out the rubber plugs and then crushed the opening of the dip tube when you installed the nipples."

To check this possibility simply open up the boiler drain and see if you have full pressure there. If you have no pressure then Growler nailed it. Good luck, Tom

ksteitle · Mar 26, 2009, 10:12 AM

I had this similar problem after I installed a new water heater (low pressure only on the hot side). I removed the factory installed di-electric nipples and the heat traps below them and used 3/4" brass nipples. This solved the problem of the low water pressure on the hot side. Hope this helps...

Milo Dolezal · Mar 26, 2009, 10:53 AM

Those factory nipples on hot water side have built-in check valve. Sometimes it gets stuck disallowing water flow.

daqueball · May 29, 2012, 12:34 PM

I had a similar issue when installing a new water heater. Once everything was connected I did not hear the tank filling when I turned the water on. I opened the hot water in a nearby bathroom...nothing. Then, when I also turned on the cold water, I could hear it filling but slowly. The cut-off valve for the water heater itself also began dripping. I disconnected the hose going into the water heater, and attached a garden hose to the incomming water line...nothing. I decided there was either a blockage in the cut-off valve itself, or in the incoming line somewhere, so I cut the pipe before the valve, replaced the valve, hooked up a garden hose...success! I then reconnected the hose going to the water heater...success again! Not sure why it worked, but it did.

New hot water heater installed, but no hot water pressure. Plenty of cold water?

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