Hot Water with Outboard

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neiloakley

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What practical options do I have for getting hot water to the galley and heads on a MF795? Pretty sure piping water through the engine will be too involved, so what are the alternatives?

I don't mind if it only runs on shorepower, as I have a big invertor I could use if I really need hot water away from the marina and forgot to heat it before I left. Not interested in any 'solar showers' though. Needs to be integrated and on tap.

The boat does have gas, but that's already being used for the hob and a propex air heater and don't want to carry loads of spare cylinders.
 
+1

I would NOT try and jury rig something that tapped into the outboard cooling system, You could ask the manufacturer if they provided such a kit, however an outboard is cooled I believe by salt water, so even if such a kit were available the corrosive impact would most likely be unacceptable.

I also suspect that the sea water does not get that warm as it is simply sucking up cold sea water and slinging it out again.

I also thing that there are diesel water heaters but I think these are only for boats that have hot water heating,

Finally there is a gas powered water heater - just make sure you buy the real thing and it is installed properly re c02 poisoning.

Immersion is the simplest option in my view.

I would be sceptical that your inverter would make much of a dent in heating a tank of water - the power drain is probably 1.5kw and it probably needs to be on for an hour.
 
omega2 said:
Kettle????, Stove????
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Doesn't fit the criteria "Needs to be integrated and on tap."

I'm sure Calorifier is the way forward, but don't actually need the Calorifier part. I wont rig it up to the outboard in anyway so will try and look for an immersion heater and tank that doesn't have the engine loop. It only needs to be 10-15 litres.

Thanks for all your replies.
 
Could do the job, but bear in mind you need water pressure going in to force the hot water out so that means a cold water tank, a pump and may be an accumulator.
 
the more water you hold the longer it will stay warm.

I can't see 10-15 lts of water being that much use as it won't really even give a shower.

50l is probably the practical minimum in my view, as is it cools it can be used without mixing, so you will get a shower for many many hours after leaving shore - quite probably the following morning.
 
 
Anders_P42 said:
They're expensive, you can get 30l marine Calorifier for £40 more:

http://www.piplers.co.uk/quick-nautic-boiler-b3-30litre

I have this model on my 33" boat, it lasts a good while washing dishes / hands.
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problem with a Calorifier is he can only heat it via electric. May as well just buy a 35ltr one of these for £83 http://www.ebay.co.uk/itm/bNEW-Electric-Water-Heater-Boiler-Hot-Shower-FOUR-CAPACITIES-AVAILABLE-/371490620915?var=&hash=item567e9105f3:m:mcDMj7Pa46e4l_bJACauhVA
 
KevB said:
this looks spot on..

http://www.ebay.co.uk/itm/Caravan-Motorhome-Truma-Ultrastore-10-Litre-Water-Heater-/171012202881?hash=item27d11f2181:m:mnEcwTqSyZ4WJACmdDYjqZQ

http://www.ebay.co.uk/itm/Truma-Ultrastore-14-Litre-Water-Heater-/172062417197?_trksid=p2141725.m3641.l6368
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I don't think the gas system would be approved for use on a boat. How are you going to vent it? Low down gas flame and petrol outboard is only going to end in disaster... un-insured probably too.
 
KevB said:
problem with a Calorifier is he can only heat it via electric. May as well just buy a 35ltr one of these for £83 http://www.ebay.co.uk/itm/bNEW-Electric-Water-Heater-Boiler-Hot-Shower-FOUR-CAPACITIES-AVAILABLE-/371490620915?var=&hash=item567e9105f3:m:mcDMj7Pa46e4l_bJACauhVA
Click to expand...

I think Op is happy plugging in shore power while in marina to heat water. Will the tank you linked to work if mounted horizontally? I doubt the internal pipe work will allow horizontal installation?
 
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