What is this?

D

dlochner

.
Jan 11, 2014
11,401
Sabre 362 113 Fair Haven, NY
SPLETS said:
This black Item is attached to the out side of the hot water heater, what is it and the brand??? It leaks and I need to replace it.

thanks all!!!
Click to expand
It is a check valve. Not sure what brand it is, there are any number of them out on the market. The check valve prevents hot water from backing up into the cold water supply. This can be an issue when heating water with the heat exchanger as it will reach ~160° and create a lot of back pressure.

You may have to rework the whole inlet. The big box hardware stores will have them for around $10.

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Captain Larry-DH

Captain Larry-DH

.
Jun 14, 2010
2,096
Robertson & Caine 2017 Leopard 40 CT
The rust on the tank by the inlet is a tell-tale some other trouble is brewing. That might be correctable or the heater might be nearing end-of-life. Either way, IMHO it should also be addressed.
 
S

SPLETS

.
Oct 8, 2008
32
Beneteau 46 Long Beach, CA
The rust has been there for years without getting worse was thinking it was a check valve, but I could not find one like it online???
 
capta

capta

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Jun 4, 2009
4,772
Pearson 530 Admiralty Bay, Bequia SVG
It doesn't matter which check valve you use for that application, as long as it is the correct size, and can take the heat of the hot water.
 
D

dlochner

.
Jan 11, 2014
11,401
Sabre 362 113 Fair Haven, NY
capta said:
It doesn't matter which check valve you use for that application, as long as it is the correct size, and can take the heat of the hot water.
Click to expand
And installed in the correct orientation. :biggrin:

Be aware, some check valves are designed to work in any orientation and some need to be horizontal.
 
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