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10-02-2018, 02:53 AM
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#1
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Lt. Commander
Join Date: May 2013
Location: Pittsburgh,Pa
Posts: 175
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Hot water heater
Hi gang,
Has anyone replaced their water heater with a tankless instant recovery/ Second has anyone just replaced it with an electric heater from lowes or home depot? I really don't see much difference.
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Mike
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10-02-2018, 12:55 PM
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#2
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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Tankless units relay on a high heat source to heat the water on demand. This is not conducive to a marine application. If in the engine compartment it must be ignition protected.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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10-02-2018, 03:05 PM
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#3
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Moderator
Join Date: Apr 2008
Posts: 5,684
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Marine hot water heaters can come with the option to be heated off of the heat exchanger as well as electric. It's also a bit more marinized and ignition protected.
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10-03-2018, 11:45 PM
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#4
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Admiral
Join Date: Mar 2012
Location: Lake Powell
Posts: 1,613
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If the water is hot it does not need to be heated. The device is a Water Heater, not a Hot Water Heater 
Also love it when people call Fenders a Bumper.
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10-04-2018, 01:53 PM
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#5
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Moderator
Join Date: Apr 2008
Posts: 5,684
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 LOL!!! Very true.
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10-09-2018, 02:37 AM
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#6
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Lt. Commander
Join Date: May 2013
Location: Pittsburgh,Pa
Posts: 175
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Why would it need to be ignition protected? Electric does not ignite like gas or propane.
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Mike
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10-09-2018, 03:41 AM
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#7
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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Quote:
Originally Posted by mrt214
Why would it need to be ignition protected? Electric does not ignite like gas or propane.
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Electric thermostat can cause a spark which can ignite any potential gas fumes. This mainly applies to items that are installed in the engine compartment which is where my water heater is. Same is true for the engines starter and alternator, these have special features that auto ones don’t.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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10-09-2018, 03:14 PM
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#8
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Moderator
Join Date: Apr 2008
Posts: 5,684
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Quote:
Originally Posted by mmwjr
Same is true for the engines starter and alternator, these have special features that auto ones don’t.
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And Battery chargers, and bilge pumps, and A/C pumps......
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10-09-2018, 04:55 PM
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#9
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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Quote:
Originally Posted by shrew
And Battery chargers, and bilge pumps, and A/C pumps...... |
And drive trim pumps, trim tab pumps, ... 
anything that can produce a spark.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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07-15-2021, 04:29 PM
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#10
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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Quote:
Originally Posted by RobertHan
You can let it run by AC power or marine engine heat. This equipment only needs minimal power as any excess can disrupt ignition. When it comes to a propane-powered heater, it has a quick recovery rate even when the temperature is low. You’ll also save on running costs. Some think that electric-powered ones tend to last longer. Nevertheless, propane-powered heaters can keep up. |
A propane tank must be stored on a well ventilated compartment on deck, not in the engine compartment. Unless you use a lot of hot water I don’t see any big savings. IMO doesn’t make sense on a boat under 35’.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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07-19-2021, 04:18 PM
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#11
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Moderator
Join Date: Apr 2008
Posts: 5,684
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Propane water heaters and fridges are not ABYC compliant. I would strongly urge anyone to NOT install either of these devices on a boat.
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