Aqua Hot Expansion Tank ???

[Rustygold]

I have a model 100-02S AquaHot unit that was recently rebuilt and is now installed in my 2004 Dynasty. I would like to move the expansion tank to a better location for filling and easier access. The tank has one feed/return line at the top and is plumbed into the top filler hole on the unit.
I need to know if when I move the tank does it have to be at the same elevation as the top of the unit's tank filler or can it be lower or higher and still function correctly in determining the level of boiler fluid.
Thanks
Dave

[1doodadd]

I would believe if you were to relocate it to a lower position and open the system it will siphon out the system because of being lower the original location. I have one on my Hurricane system and its location is higher than the burner itself, also has a surge tank working with the expansion tank.

[Dennis4809]

This expansion tank works just like the one one most autos. If the radiator is full, as it heats up, the fluid expands and pushes past the pressure cap to the expansion tank. When shut off, the fluid cools, reduces in volume and pulls from the expansion tank so that the radiator remains full. Just as the expansion tank on your car doesn’t need to be level with the top of the radiator, this expansion tank doesn’t need to be level with the fluid in the AH.

[Steve Ownby]

Originally Posted by Rustygold

I have a model 100-02S AquaHot unit that was recently rebuilt and is now installed in my 2004 Dynasty. I would like to move the expansion tank to a better location for filling and easier access. The tank has one feed/return line at the top and is plumbed into the top filler hole on the unit.

I need to know if when I move the tank does it have to be at the same elevation as the top of the unit's tank filler or can it be lower or higher and still function correctly in determining the level of boiler fluid.

Thanks

Dave

You should call AquaHot customer service & ask this question. I don’t believe there are any specific requirements as to mounting height.

The feed/return line actually exits the bottle at the bottom. The top fitting is for an overflow line.

[bobcovey]

Dave,

My initial thought agreed with 1doodad, but http://www.aquahot.com/files/install...nual_07-05.pdf page 47 says it canbe located above or below the unit.

Cheers,

[vito.a]

Dave, in our 2004 the Aqua Hot expansion tank is mounted in the basement fuel compartment on the forward bulkhead. I assume yours is in the same place? It can be difficult to access but it requires so little use I haven't thought about relocating it.
In our 2007 the expansion tank was in the rear bulk head next to the engine (a much higher location). It was easier to access but again it only needs servicing once per year.

Was your system leaking boiler fluid before the rebuild?
Hopefully once you get all the air out you will not need to access it again for a very long time.

[Rustygold]

Originally Posted by vito.a

Dave, in our 2004 the Aqua Hot expansion tank is mounted in the basement fuel compartment on the forward bulkhead. I assume yours is in the same place? It can be difficult to access but it requires so little use I haven't thought about relocating it.
In our 2007 the expansion tank was in the rear bulk head next to the engine (a much higher location). It was easier to access but again it only needs servicing once per year.

Was your system leaking boiler fluid before the rebuild?
Hopefully once you get all the air out you will not need to access it again for a very long time.

Yes mine had a leak in both the boiler tank and the water side as well. It was rebuilt by John at Heat My RV.
Took some time to install, but not as hard as I had envisioned. She fired right up and good to go with the hot water side anyway. Now if I could only get the fans at the hydronic outlets to work. My next endeavor.

[Rustygold]

Originally Posted by vito.a

Dave, in our 2004 the Aqua Hot expansion tank is mounted in the basement fuel compartment on the forward bulkhead. I assume yours is in the same place? It can be difficult to access but it requires so little use I haven't thought about relocating it.
In our 2007 the expansion tank was in the rear bulk head next to the engine (a much higher location). It was easier to access but again it only needs servicing once per year.

Was your system leaking boiler fluid before the rebuild?
Hopefully once you get all the air out you will not need to access it again for a very long time.

Mine is/was in the same place, however when I put the rebuilt AquaHot in, I did't like the look of the return line. It was easier to move the the bottle and plumb a new and shorter piece of tubing.

[Jetskier50]

That's a good question for Roger Berkeley over at http://www.rvhydronicheaterrepair.com

He helped me get out AquaHot heat going. The water side worked fine but the furnace side wouldn't

[Ken Thompson]

I have a 2001 Monaco with the aqua hot and love it! For some reason the coolant level in the overflow tank never moves. I have removed the radiator cap on top and the level is up to the cap. Any ideas?

[Steve Ownby]

Originally Posted by Ken Thompson

I have a 2001 Monaco with the aqua hot and love it! For some reason the coolant level in the overflow tank never moves. I have removed the radiator cap on top and the level is up to the cap. Any ideas?

Try turning both the electric element and the diesel burner off over night. If the system is working correctly, as the coolant tank cools, the level in the expansion tank will fall.

[96 Wideglide]

Originally Posted by Ken Thompson

I have a 2001 Monaco with the aqua hot and love it! For some reason the coolant level in the overflow tank never moves. I have removed the radiator cap on top and the level is up to the cap. Any ideas?

May be time for a new radiator cap.
Also, check the rad cap end of the clear hose that feeds the overflow tank. Over time, it get's brittle.

[Ken Thompson]

Thanks for the replies.the cap was my first guess. It was bad, but the new one didn’t change the level in the expansion tank.