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Hot Water Heater Drain
- denpooch
- Commander
- Posts: 385
- Joined: April 9th, 2017, 8:03 pm
- Vessel Info: 2005 360 Mariner
Crusader 6.0 Captains Choice - Location: Long Island
- Has thanked: 85 times
- Been thanked: 86 times
Hot Water Heater Drain
On my 2005 Mariner there is a thru hull 'drain' for the hot water heater.
Does anyone know how to have the unit drain through that plumbing? It's there, I just can't figure out what combination of 'valves' leading into the heater will make it happen.
in the past I simply open the spigot on the heater, lift the pressure release and the water flows onto the deck.
It would be nice to use it as designed but don't know how.
Thanks.
- Midnightsun
- CYO Supporter
- Posts: 2850
- Joined: March 27th, 2016, 2:27 pm
- Vessel Info: The Midnight Sun
2007 41CMY
Volvo D6-370's - Location: Montreal, Canada
- Has thanked: 257 times
- Been thanked: 1099 times
Re: Hot Water Heater Drain
in the past I simply open the spigot on the heater, lift the pressure release and the water flows onto the deck.
Thats how it is supposed to be done, nothing more. It can happen that deposits start to plug the drain hole so you may need to remove the valve and run a wire in there to flush out the crud a little. Obviously take care to do this when the heater has been off for quite some time to avoid burning your hands.
- denpooch
- Commander
- Posts: 385
- Joined: April 9th, 2017, 8:03 pm
- Vessel Info: 2005 360 Mariner
Crusader 6.0 Captains Choice - Location: Long Island
- Has thanked: 85 times
- Been thanked: 86 times
Re: Hot Water Heater Drain
It's odd because a diagram in the owners manual details 'water heater drain'.
I wonder if it has to do with a specific combination of the three 'on-off' valves. There is the cold water 'into' the unit. A hot water 'out' and also a 'bypass' valve which I turn on when draining the heater. This bypass allow me to get by using just a couple of gallons of pink instead of filling up the heater.
Thanks for your input.
-
- CYO Supporter
- Posts: 5810
- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807 Aft Cabin
- Location: Ontario, Canada
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Re: Hot Water Heater Drain
- Midnightsun
- CYO Supporter
- Posts: 2850
- Joined: March 27th, 2016, 2:27 pm
- Vessel Info: The Midnight Sun
2007 41CMY
Volvo D6-370's - Location: Montreal, Canada
- Has thanked: 257 times
- Been thanked: 1099 times
Re: Hot Water Heater Drain
denpooch wrote:Source of the post Hans there is no drain hole. The water just runs forward on the deck and into the sea.
It's odd because a diagram in the owners manual details 'water heater drain'.
I wonder if it has to do with a specific combination of the three 'on-off' valves. There is the cold water 'into' the unit. A hot water 'out' and also a 'bypass' valve which I turn on when draining the heater. This bypass allow me to get by using just a couple of gallons of pink instead of filling up the heater.
Thanks for your input.
The 3 valve bypass is rather common on most boats however this will not drain the heater and is used exactly as you described to bypass the water heater when introducing antifreeze. How are you draining the water heater with no drain? Not following you on the "water just runs forward on the deck and into the sea".
- denpooch
- Commander
- Posts: 385
- Joined: April 9th, 2017, 8:03 pm
- Vessel Info: 2005 360 Mariner
Crusader 6.0 Captains Choice - Location: Long Island
- Has thanked: 85 times
- Been thanked: 86 times
Re: Hot Water Heater Drain
The water heater is forward behind the 'rumble seat' on the bow of the boat. When I open the spigot and release the pressure valve, the water runs forward (Mariners list slightly forward due to 150 foot chain in the anchor locker)
and 'off the boat'.
Thanks to you and Viper. I will proceed as usual.
- bud37
- Admiral
- Posts: 4683
- Joined: April 23rd, 2015, 10:22 pm
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Re: Hot Water Heater Drain
Yes there is no way the water would drain anywhere but down the deck to the bow considering the deck slope.
- denpooch
- Commander
- Posts: 385
- Joined: April 9th, 2017, 8:03 pm
- Vessel Info: 2005 360 Mariner
Crusader 6.0 Captains Choice - Location: Long Island
- Has thanked: 85 times
- Been thanked: 86 times
Re: Hot Water Heater Drain
Open the spigot...release pressure valve and walk away.
Bypass the heater, add 2 gals of pink into fresh water system, run pink out of each faucet. Force pink thru 'city water' input and the fresh water system is ready fo hibernation.
Ran fresh water through A/C system. Forced pink til it came out of both thru hulls and done.
Engines this weekend.
Thanks again guys.
- Midnightsun
- CYO Supporter
- Posts: 2850
- Joined: March 27th, 2016, 2:27 pm
- Vessel Info: The Midnight Sun
2007 41CMY
Volvo D6-370's - Location: Montreal, Canada
- Has thanked: 257 times
- Been thanked: 1099 times
Re: Hot Water Heater Drain
- bud37
- Admiral
- Posts: 4683
- Joined: April 23rd, 2015, 10:22 pm
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Re: Hot Water Heater Drain
What ever little organisms are swimming around in the raw water side you will introduce to your fresh water side by pumping this way.......we never used our fresh water system for drinking even though it was sanitized in the spring at start up.....so be aware. If unsure, a fresh water test sample can be taken and analyzed to ensure safety.
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