zmotorsports wrote:

Is the surge tank full of water or glycol at this point or is it empty or is it somewhere between 'full cold' and 'full hot'? Mike.

zmotorsports wrote:

I don't see how it can be straight water. The only place the domestic water comes close to the glycol is where the copper tubing is wrapped around the boiler tank and that has two barriers being the copper tube and the tank itself. Do you have a serial number off of the Aqua-Hot unit. The first two digits tell the year it was manufactured and the four digits after the dash tell what number it was in that year of production. I am wondering if maybe they had a design change somewhere between 02 when mine was produced and yours. I just don't see how the water could inject itself into the glycol system unless it was inside the tank like you mentioned. That doesn't make sense because I would think they would have a model number change if that was the case. Mike.

zmotorsports wrote:

Do you know or not if he drilled the rivets and removed the insulation on the tank/coil or just saw the lines going into the other half of the enclosure? I would think if they had a design change they would have a different model number unless they seperate it by serial number only. If this is the case I wonder why they decided to run the lines internally. Did the guy at Aqua-Hot say if they had a design change? Mike.

Locomotiveman wrote:

Go to www.hydronicRVheating.com ?? (RogerBerke is the Moderator/Genius of that Web-site.) Knows em'inside-out, ask him anything. Aqua-Hot's very long coil of water is surrounded in a gell/paste filled pressure vessel. One fella flushed his with Clorox bleach. Ate a hole in the line. Shot. TOM