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RussWhite · 11-04-2011, 10:51 PM

Hi Jeff and Pam,

While I can't speak for everyone I will be glad to give you my thoughts and will assume you have the same vintage AquaHot as I do :
Model 431XE/12
S/N 98487XE

First I am not sure what you are contemplating as there is no recommendation to replace the coolant based on age or hours. It does not come into contact with any engine or burner contaminates and should last a very long time. There have been reports of the ph getting out of range. It should be above 7.5 and not alkaline according to Roger Berke - kind of a AquaHot guru. If you are considering a wholesale change, just beware there is a lot of it in the system and it is very difficult to get all the air out later. If you are just wanting to top off the overflow bottle, that is much easier. The coolant used is a 50/50 mix of ethylene glycol and water ( distilled would be best ). Hope that helps.

Russ

11-04-2011, 10:51 PM	#2
RussWhite Senior Member Join Date: Jan 2010 Posts: 346	Hi Jeff and Pam, While I can't speak for everyone I will be glad to give you my thoughts and will assume you have the same vintage AquaHot as I do : Model 431XE/12 S/N 98487XE First I am not sure what you are contemplating as there is no recommendation to replace the coolant based on age or hours. It does not come into contact with any engine or burner contaminates and should last a very long time. There have been reports of the ph getting out of range. It should be above 7.5 and not alkaline according to Roger Berke - kind of a AquaHot guru. If you are considering a wholesale change, just beware there is a lot of it in the system and it is very difficult to get all the air out later. If you are just wanting to top off the overflow bottle, that is much easier. The coolant used is a 50/50 mix of ethylene glycol and water ( distilled would be best ). Hope that helps. Russ