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tim_farrell's picture
tim_farrell
Last seen: 1 week 6 days ago
Joined: 3/15/11
Posts: 117
Water heater when boat isn't plugged in

Basic question about hot water on my MK1. Is there anything I need to do to got hot water while I'm running the engine? Hot water works perfectly when I'm plugged in. But nothing when on mooring or underway. Is there a specific configuration I need to set in the plumbing?

Tim Farrell
S.V. Kailua
C36 - 1986
Hull# CTY0678A886

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Tim Farrell
S.V. Kailua
C36 - 1986
Hull# CTY0678A886
pkeyser's picture
pkeyser
Last seen: 14 hours 46 min ago
Joined: 5/18/13
Posts: 386

Tim-
It sounds like you either don't have an antifreeze line/circuit  running from the engine to your water heater, or you do, and it's not working. I'm assuming you have a line. It's likely that if you trace the antifreeze lines, you will find a valve somewhere, and if it is closed, it will be preventing hot antifreeze from circulating in the water heater. Locate the antifreeze circulation pump on the engine and trace the lines from that. If uncertain about what is flowwing through a particular hose, loosen the hose clamp and see what drips out.

I had a 1986 C30 with a valve on the antifreeze line that could close so it wouldn't circulate through the water heater. I'm not sure why Catalina did this. The vavle was located in a really obscure place on the C30. It was a gate valve (like on your garden hose outlet). I couldn't suggest where to look on the C36.

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Paul & Wendy Keyser
"First Light"
Newburyport MA/Rye NH
2005 C36 MKII #2257
Wing, M35B

KevinLenard's picture
KevinLenard
Last seen: 1 hour 49 min ago
Joined: 1/28/15
Posts: 111

Tim, there are several posts on the subject, but having had this happen this spring, my local 'ancient mariner' said that after sailing the boat a bit and 'burping' the system, the airlock in the line should clear.  While that fixed it for us, I'd go with Paul's suggestion first.  I added valves on either side of the hot water intake/output to allow me to shut the lines off and blow the water out in the fall.  A PO might have done the same. 

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Kevin Lenard
"Firefly"
'91 C-36 Tall Rig, Fin Keel, Hull #1120, Universal M-35 original (not "A" or "B")
CBYC, Scarborough, Ontario, Canada

tim_farrell's picture
tim_farrell
Last seen: 1 week 6 days ago
Joined: 3/15/11
Posts: 117

Very helpful. Thanks all. I will be aboard this weekend and check for a valve. Will report back.

Tim

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Tim Farrell
S.V. Kailua
C36 - 1986
Hull# CTY0678A886
LeslieTroyer's picture
LeslieTroyer
Last seen: 1 week 21 hours ago
Joined: 3/13/16
Posts: 454
My 1983 #94 never had lines run from engine to water heater.
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Les & Trish Troyer
Mahalo 
Everett, WA
1983 C-36 Hull #0094
C-36 MK 1 Technical Editor. 
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