2008 340DA water heater

Fly4Kix · Sep 24, 2020

It appears the PO bypassed the water heater completely and routed water from the cold manifold down to the hot manifold. Both the surveyor and I missed this at the prepurchase inspections. I'm scratching my head how to connect the heater back into the system. It appears they used factory hoses to do this but I can't seem to make the connections work with them. Would anyone have a pic of their setup or link to water system diagram? I've done some searching on here and in the owners manuals but no luck.

Thanks!

KevinC · Sep 25, 2020

Fly4Kix said:
It appears the PO bypassed the water heater completely and routed water from the cold manifold down to the hot manifold. Both the surveyor and I missed this at the prepurchase inspections. I'm scratching my head how to connect the heater back into the system. It appears they used factory hoses to do this but I can't seem to make the connections work with them. Would anyone have a pic of their setup or link to water system diagram? I've done some searching on here and in the owners manuals but no luck.

Thanks!

Facing the unit cold water should enter on the right side and the hot water should exit on the left. There may be a cold water crossing to this for a mixing valve. The hot should go from the mixing valve to the manifold.

For winterizing many time you will have the cold water in bypassed to the hot water out. If this is the case you will just need to reconnect. Also make sure that the hot water drain is closed as people will sometimes leave that open after winterizing.

Just an FYI, if your tank was empty and you tried to turn the heater on and left it for a while you may have burned out the element. If that is the case don't panic ... the element is accessed from the front of the water heater and can be removed. 120VAC goes to the unit so make sure the breaker is off when removing. The element should be a standard size and can probably be sourced in Home Depot, Lowes etc.

-Kevin

Fly4Kix · Sep 25, 2020

KevinC said:
Facing the unit cold water should enter on the right side and the hot water should exit on the left. There may be a cold water crossing to this for a mixing valve. The hot should go from the mixing valve to the manifold.

For winterizing many time you will have the cold water in bypassed to the hot water out. If this is the case you will just need to reconnect. Also make sure that the hot water drain is closed as people will sometimes leave that open after winterizing.

Just an FYI, if your tank was empty and you tried to turn the heater on and left it for a while you may have burned out the element. If that is the case don't panic ... the element is accessed from the front of the water heater and can be removed. 120VAC goes to the unit so make sure the breaker is off when removing. The element should be a standard size and can probably be sourced in Home Depot, Lowes etc.

-Kevin

Thanks Kevin! It appears that might be part of it, I'm having an issue getting the hot water out up to the hot water manifold using the remaining red pen hosing. One end is a straight fitting, the other has a 90*. I'm assuming the straight goes to the hot water out on the heater and the 90 goes on the manifold?

KevinC · Sep 25, 2020

Fly4Kix said:
Thanks Kevin! It appears that might be part of it, I'm having an issue getting the hot water out up to the hot water manifold using the remaining red pen hosing. One end is a straight fitting, the other has a 90*. I'm assuming the straight goes to the hot water out on the heater and the 90 goes on the manifold?

Unfortunately I don't have a picture handy but on mine the upper left output has a smaller riser and a mixing valve. The mixing valve has a cold water input and the hot water output that goes to the manifold.

-Kevin

R-and-R · Sep 25, 2020

Mine is an ‘02 with a mixing valve (also called a tempering valve).
Not sure if this will help you.
First 2 pics are normal operation.
Last pic is "bypassed."

Fly4Kix · Sep 25, 2020

R-and-R said:
Mine is an ‘02 with a mixing valve (also called a tempering valve).
Not sure if this will help you.
First 2 pics are normal operation.
Last pic is "bypassed."

Thanks. Mine has a mixing valve as well but both hot and cold manifolds are located above the water heater. I believe @KevinC hit on part of it, probably bypassed for winterizing last year and didn't get reconnected in spring. I'm beginning to wonder if the manifolds have been moved from the original locations as the warm line from the heater up appears to be a bit short and not quite angled correctly.

Fly4Kix · Sep 29, 2020

I wanted to circle back in case anyone comes down this road at a later date. It appears at some point in the past the water manifolds were shifted around. I ended up building my own line from the water heater up to the manifold, luckily our boat has 1/2" PEX and so fittings are easy to find locally.

2008 340DA water heater

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