Water Heater on Hunter 38

[Sergey Vetrov]

Good morning Hunters Team
I have Hunter 38 2006. Water from my Water Heater is pretty hot whet it is plugged to shore power but just warm when it heats by engine. I have tried to locate Thermostatic Mixing valve to increase temperature but could not find it. Any idea whre is it located? Also trying to explain to myself how it works with shore power - is any heater cut off based on set temperature?
Any of your comments will be great appreciated...

 

[Bob 04 H260]

Our water is hot when plugged in the wall and scalding hot when heated by the engine. I have a temperature gauge on the engine and it is running between 160 and 180* depending on how hard I'm pushing it.
Be sure your engine is getting up to temperature, check for air in the coolant circuit going through the hot water heater. It may need to be "burped". Check coolant hoses are not pinched or otherwise occluded reducing flow through the heat exchanger in the water tank.
Bob

 

[seadaddler]

The mixing value should be right on the water heater at one of the inlet connections.
Nick

 

[Allan12210]

I doubt you have a mixing valve. It provides for constant temperature independent of heat source. So if the water is hotter when electrically heated then something is wrong with the engine source. A mixing valve would not let the electric heated water be any warmer than the engine heated if the set point were too low. In addition to the excellent suggestions above from Bob, you might have to pull the engine thermostat and make sure its the right one or that its not stuck wide open. There are thermostats for seawater cooled engines that open at much lower temperatures than fresh water cooled engines need to run at. Maybe someone put the wrong one in. After you solve this issue then you should put in a mixing valve because there will be the opportunity to get scalded. Search for thermostatic mixing valves and you'll see how I installed mine earlier this year.

 

[seadaddler]

What Allen said as far as the thermostat in the engine is not allowing water from to get
very hot but my 2007 H-36 does have a mixing value on my hot water heater and is that way new from factory so would be surprised 2006 doesn't have one.
Some other helpful info is where the connections of cold water go into the water heater
have screens built in and mine did get very clogged so much that it mad the hot water very low pressure coming out the shower sprayer but after taking apart and cleaning back to normal pressure and seem to be the hot water side only when it happen.
Nick

 

[Sergey Vetrov]

Thank you Bob, Nick and Alan
Appreciate your suggestion - will do my research on weekend!
Will come back with findings...

 

[quadrille38]

If it were the mixing valve it would be the same temperature regardless of heat source.

I have a 38 and have had to replace the mixing valve. Even thought that's not your cause if you want information on the valve do a search of the archives. I found several good posts and got some great help when I was trying to figure out and fix my situation.

 

[Sergey Vetrov]

Thank you "quadrille38". I have searches Forum already and found ample of very helpfull information related to thermostatic valve, etc
Love Hunters Forum and very happy to be part of it!

 

[seadaddler]

I think the mixing value doesn't come into play when the water is being heated
by engine running and if the engine thermostat is keeping the engine from reaching a higher
water temp than what the shore power heats the water to.
The shore power water heater will work off the the heating elements built into the water heater of the shore power but the engine heating of water will not get help from that part of the water heater and the engine heating of water is strictly done by the engine thermostat
reaching a set temp.
So I think it is the engine thermostat opening at a lower temp than the shore power temp,could get one of those hand held temp reading and use it to check engine temp and than shore power temp.
Nick

 

[Scott B]

The manual may also help.

Force 10 Water Heater

 

[Sergey Vetrov]

Hi All
Found my issue on weekend. My Forcer 10 Heater has a TCV (Temperature Compensation Valve) which designed to reduce coolant flow when water temperature reaches 60degC. Looks like my TCV was blocking majority of Coolant flow. I have removed TCV and basically convert my Heater to NO TCV version. After 20 min with Engine running I had water temperature about 60-65 degC. Have to get new one to make sure that I will not keep it too hot during long motoring trips...
Thjank you all for help and advices! My wife is happy now with her hot shower!!!!!!!!!!
Sergey

 

[Gene S]

On my boat that has a Quick boiler, one of the coolant hoses to the engine was collapsed. Replacing it did the trick.