Are there check valves

Mile High wrote:

Old-Biscuit wrote:

Mile High wrote:
Why would there be a check valve on the cold inlet?

Some have used a check valve on cold inlet......allows cold water to enter but prevents hot from backflowing into cold.

Ah, OK. That would make sense. I just couldn't figure out an application.

this is how our check valve has been installed. On the bottom.

chevman

Old-Biscuit wrote:

Mile High wrote:
Why would there be a check valve on the cold inlet?

Some have used a check valve on cold inlet......allows cold water to enter but prevents hot from backflowing into cold.

Ah, OK. That would make sense. I just couldn't figure out an application.

Mile High wrote:
Why would there be a check valve on the cold inlet?

Some have used a check valve on cold inlet......allows cold water to enter but prevents hot from backflowing into cold.

Lots of configurations .........different ideas/reasons
1 valve systems, 2 valve, 3 valve, 1 check valve, 2 check valves, NO check valves

Sorta like 6 of one/half a dozen of other :B

Why would there be a check valve on the cold inlet?

Mile High wrote:
Check valves are only provided if the rig is equipped with a single valve winterizing system. It is on the hot outlet side and prevents antifreeze from returning to the tank with the bypass on.

A winterizing system with two valves, or no winterizing system, does not require the check valve and it may not have been installed.

Depends on where the 2 valves are installed.....

If just a cold inlet and a bypass valve then hot outlet would need a check valve to stop backflow when in 'bypass mode'

IF the 2 valves are 3 way valves then there may not be any check valves.

All depends on how/what is installed.

Sometimes the check valve is on cold inlet, most times on hot outlet.
They are an internal part of the 'nipple' right at the tank.

Check valves are only provided if the rig is equipped with a single valve winterizing system. It is on the hot outlet side and prevents antifreeze from returning to the tank with the bypass on.

A winterizing system with two valves, or no winterizing system, does not require the check valve and it may not have been installed.

I haven't really noticed one on my 2008 Starcraft R/T Suburban setup... If there is one there it must be external to the water heater maybe. It would most likely be only on the HOT WATER side as the COLD WATER port is used to fill the hot water heater as well. I guess there could one installed but the check valve directions would have to be different like shown in this pictorial...


I use the three VALVE BYPASS setup on mine which would not require ONE WAY VALVES I guess...


Roy Ken

Yes Suburban WHs have a check valve....hot outlet......plastic body and internals.

Replace with a brass one.......CAMCO makes one. About $8





rtaylor0830......

Here is a pretty good guide put together with pictures covering troubleshooting/repair Suburban WHs.
It is NOT a technical manual...just a plain written one.
LINK

Yes, the Suburban DOES have a check valve. On the outlet from the heater. Stop by your favorite RV supply/big box/hardware store and purchase a new one and install it with teflon tape or PTFE liquid. Lots of messages on various forums about this same problem. It's very common.

See post and pictures here: http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/27672366/gotomsg/27672687.cfm#27672687

No there are none on the water heater.