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HVAC, Air Conditioners, Aqua Hot, Primus, Webasto, Chassis Heaters, Furnaces and Water Heaters Questions and information about the wide variety of Heating and Air Conditioning as well as Water Heater systems available are discussed here.

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  #11  
Old 01-17-2020
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irmagoo irmagoo is offline
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Quote:
Originally Posted by BrianS View Post
Randy, the HydroHots are somewhat different from AquaHots in that the copper coil that circulates your fresh water is on the outside of the tank on the aquahot, and on the inside of the tank on the hydrohot. The fear is that if there is a small leak on the coil in the hydrohot, antifreeze can get into your potable water. And we all know ethylene glycol (normal antifreeze) is poisonous. Boiler coolant (propylene glycol) is supposedly safe to drink and not poisonous.
its not safe to drink it can/does cause damage to your central nervous system-it is less toxic than ethylene glycol but i would strongly suggest you dont drink it.
in my 50 years experience with boiler systems we alway have 2 layers of separation from boiler water to drinking water-like boiler water heats one side tube to tube heat exchanger and that heat one side of tube to tube heat exchanger and it heats the domestic water. better safe than sorry and in my world it was/is code.
just something to think about....mike
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  #12  
Old 01-17-2020
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Default Aqua Hot Coolant

The original Aqua Hot had the hot water coil on the outside of the tank and had a pressure cap on the system. The replacement Aqua Hot tank from John Carrillo Hydronic Heating has the heating coil inside the tank and it does not have a pressure cap. It does require the pink boiler coolant propylene glycol because of the location of the heating coil. We have had the system for over a year and it works fine we are enjoying the heat very night here in Quartzite.
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  #13  
Old 01-17-2020
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As a follow up - thank you for all the responses - we spoke with Aqua Hot and they suggested we use the Ethylene Glycol which is what we're going to use after we flush the system.

We do have the option of using either but to keep it simple are just going to go with their recommendation.
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  #14  
Old 01-17-2020
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Originally Posted by lucaswillemse View Post
The original Aqua Hot had the hot water coil on the outside of the tank and had a pressure cap on the system. The replacement Aqua Hot tank from John Carrillo Hydronic Heating has the heating coil inside the tank and it does not have a pressure cap. It does require the pink boiler coolant propylene glycol because of the location of the heating coil. We have had the system for over a year and it works fine we are enjoying the heat very night here in Quartzite.
Interesting.
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  #15  
Old 01-17-2020
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Originally Posted by georgiavette View Post
As a follow up - thank you for all the responses - we spoke with Aqua Hot and they suggested we use the Ethylene Glycol which is what we're going to use after we flush the system.

We do have the option of using either but to keep it simple are just going to go with their recommendation.
Mike M and i spent a lot of time talking about what fluid to use.
Mike did boiler stuff for a living and he knows what hes talking about.
The problem with any of the coolants is you have to check the PH and none of us ever do.
If the PH balance is not right the system can and will rust out.
Mike has a rust problem right now,which is why we have been talking about it.
My aquahot is getting flushed and cleaned soon,i am going to fill back with plain water and use soluble oil in the water as a rust preventative.
Its not anti freeze,but i live in a warm climate and when we do get cold weather my aquahot is on to keep the bus warm.
Water soluble oil is used in lots of milling machines and old tractors and other equipment.
NAPA has it..
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  #16  
Old 01-17-2020
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Quote:
Originally Posted by irmagoo View Post
its not safe to drink it can/does cause damage to your central nervous system-it is less toxic than ethylene glycol but i would strongly suggest you dont drink it.
in my 50 years experience with boiler systems we alway have 2 layers of separation from boiler water to drinking water-like boiler water heats one side tube to tube heat exchanger and that heat one side of tube to tube heat exchanger and it heats the domestic water. better safe than sorry and in my world it was/is code.
just something to think about....mike
So you got started at age 5?
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  #17  
Old 01-17-2020
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So you got started at age 5?
Hes 10 years younger today than the day i met him,10 years ago.
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