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Hot Water Tank
- hcarmich
- Scurvy Dog
- Posts: 24
- Joined: March 8th, 2021, 9:55 am
- Vessel Info: still looking
- Location: Ottawa Ontario Canada
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Hot Water Tank
My 28 Riv has a hot water tank that can be heated with shore power or by one of the water cooled engines - through the heat exchanger. We think there is a break in the heat exchanger and that water is escaping.
Here is our plan, but I need some help.
1. We plan on disconnecting the hoses from the engine at the hot water tank heat exchanger connections.
2. We will install 2 valves on the connections on the hot water tank for the heat exchanger (this will close things off).
Question. Can I cap off the two hoses to/from the engine or do they need to be in a loop? The problem is it is pretty tight in there and connecting the two hoses in a loop is pretty challenging.
Really appreciate the help
thank you
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- CYO Supporter
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- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807 Aft Cabin
- Location: Ontario, Canada
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Re: Hot Water Tank
- hcarmich
- Scurvy Dog
- Posts: 24
- Joined: March 8th, 2021, 9:55 am
- Vessel Info: still looking
- Location: Ottawa Ontario Canada
- Been thanked: 1 time
Re: Hot Water Tank
thank you
- km1125
- Admiral
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Re: Hot Water Tank
Do not use regular PVC... it's not rated for HOT water.
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- CYO Supporter
- Posts: 5810
- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807 Aft Cabin
- Location: Ontario, Canada
- Has thanked: 432 times
- Been thanked: 1588 times
Re: Hot Water Tank
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- CYO Supporter
- Posts: 2291
- Joined: March 28th, 2016, 10:52 pm
- Vessel Info: 1998 Carver 355
Suspicious Fishes !
2022 Kawasaki 310X - Location: upper chesapeake bay
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Re: Hot Water Tank
If there is a leak water will definitely come out of the exchanger inlet/ outlet. The dock water is 3x pressure or your engine coolant.
As such, if your problem is losing engine coolant its not there. You would be gaining coolant from the higher pressure potable water system.
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- CYO Supporter
- Posts: 5810
- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807 Aft Cabin
- Location: Ontario, Canada
- Has thanked: 432 times
- Been thanked: 1588 times
Re: Hot Water Tank
What makes you think you have a leak there? Are you loosing water from your water tank? If so, have you eliminated other possibilities? Is there water in the bilge?
- hcarmich
- Scurvy Dog
- Posts: 24
- Joined: March 8th, 2021, 9:55 am
- Vessel Info: still looking
- Location: Ottawa Ontario Canada
- Been thanked: 1 time
Re: Hot Water Tank
To summarize, our problem is that when we fill the water tanks (2), turn on the water pump, we are losing water. No leaks around the pump/hot water tank, no additional water in the bilge(s). All taps closed, pump turns on to pressurize the line, shuts off, then after about 4 minutes, comes on again after losing pressure. Eventually, no water left.
We suspect the heat exchanger might be the culprit.
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- CYO Supporter
- Posts: 2291
- Joined: March 28th, 2016, 10:52 pm
- Vessel Info: 1998 Carver 355
Suspicious Fishes !
2022 Kawasaki 310X - Location: upper chesapeake bay
- Has thanked: 314 times
- Been thanked: 583 times
Re: Hot Water Tank
-
- CYO Supporter
- Posts: 5810
- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807 Aft Cabin
- Location: Ontario, Canada
- Has thanked: 432 times
- Been thanked: 1588 times
Re: Hot Water Tank
A sure test would be to remove the engine lines from the hot water tank and turn on the water pressure. If water continues to run out of the exchanger ports on the tank, then you've found your leak.
When you say "no additional water in the bilge" is there ANY water in the bilge, and if so, how sure are you that there's no additional amount that is periodically being pumped overboard by the bilge pump? If there's water in the bilge, vacuum it out, turn on the pump and monitor the bilge for water accumulation. If you see water slowly accumulating, you could have a plumbing leak instead.
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