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Old 10-12-2011, 04:53 PM
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Default cabin heat and water heater

I've tried doing some research but cant seem to bring anything up. I'm looking to heat my searay 220 da cabin and cockpit, but I'm also wanting to install a hot water heater. Does someone make a combination hot water heater and air heater that isn't $2000 and a real pain to install? thanks for all the help
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Old 10-12-2011, 05:07 PM
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im in the same dilemma i was considering a diesel heater for the heat
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Old 10-12-2011, 05:19 PM
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....... I'm also wanting to install a hot water heater. ...........
Why would you want to heat hot water?

Your boat has a potable water system, but no water heater?

You want to heat the water and cabin while underway or just on shorepower?

I've never seen a combination air/water heater for a boat. That's not saying there is no such thing, just that I have not seen one so if there is one, it's not very common.

West Marine sells a small electric space heater that should heat your cabin just fine if shore power is available. It's low and flat so it can't easily tip over. I bought one for when my reverse cycle AC unit was out of service a couple winters ago.

Boat water heaters are pretty much all the same. Water connections and electrical connections. Many also alow you to heat water with waste heat from the engine. That's two more hoses.
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Old 10-12-2011, 05:30 PM
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I want to be able to have heat for sure underway. I can deal with just having hot water under shore power. and yes I have potable water but no water heater I was surprised also when I bought the boat
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Old 10-12-2011, 07:37 PM
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There are a number of marine water heaters which have a coil for heating water off the engine (assuming you have an inboard), and also 110 volts when on shore power. You can put a "red dot" type of heater for heating the cabin under way. It will not heat when at the dock or on shore power.

There are a number of hydronic heating systems, using diesel as a fuel, and circulating hot water thru small radiators to heat the boat at all times. These will also heat water for domestic use. But these are not cheap--the burners have to be rather sophisticated with safety devices, and expensive.
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Old 10-12-2011, 08:19 PM
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The hyrdonic sounds like what im looking for. I don't want to have to have my inboard running at all times for heat and hot water
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Old 10-13-2011, 08:13 AM
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Get your west marine and defender catalogs out and get an idea of what's out there and the cost and complexity.
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Old 10-13-2011, 08:42 AM
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You going to need 2 separate systems. The Hyrdonic is NOT going to be cheap or easy, forget that!!!

Hot water is easy: two options:
1. Install a regular marine Hot water heater. Plumb fresh water line to it, plumb the hot water line out of it to where-ever you need it (galley sink, shower...), then run +120 volts to it. Mount it and your done. Most marine hot water heaters also have a inlet for the engines coolant/hot water, which allows you to make hot water while your engines are running. So for that just plumb you engines hot collant line to the hot water heater and back, very easy and simple.

2. Go to Home depot, or buy online and get an Ariston 4 gallon "under sink hot water heater". They are small and REALLY easy to install. They are made for RV's or under a sink at home where it takes a while to get hot water to it (long run from regular hot water heater). They cost only $170 and are nice and small. I installed one on my last boat, and it worked like a charm for 7 years. I also installed one a few months ago in a freinds boat, he loves it.

http://www.google.com/products/catal...ed=0CG0Q8wIwAQ#

For heat, you will need a marine AC/reverse cylce heat unit, or separte electric marine heater. But for both of those you will need 120v AC power, aka shore power OR the genset running all the time.

Good luck.
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Old 10-13-2011, 09:38 AM
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Another way would be to use a heater core, just like a car uses. If you have the room you could make a box with the heater core and a fan. This only requires two hoses coming off your engine, and a 12v fan. These units are used all the time in vans, and you could probley find one in a bone yard and modify it to your needs. Look at Chevy Astro and GMC Safari Vans. They had a neat little self contained rear heater also.

It still would not solve your need for heat when the engine is off. But at the dock you could use elec heat.
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Old 10-14-2011, 01:51 AM
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A word on Webasto, Eberspacher, Mikuni et hot diesel furnace hot air & water heater. we do not rate them for use aboard petrol engined boats at all and specifically exclude them for use on such craft.
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Old 10-14-2011, 04:30 AM
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Another way would be to use a heater core, just like a car uses. If you have the room you could make a box with the heater core and a fan. This only requires two hoses coming off your engine, and a 12v fan. These units are used all the time in vans, and you could probley find one in a bone yard and modify it to your needs. Look at Chevy Astro and GMC Safari Vans. They had a neat little self contained rear heater also. .
You can buy these designed for use on boats. All components included.
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Old 10-14-2011, 07:17 AM
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You can buy these designed for use on boats. All components included.

Ron where is the fun in that. I bet they are very expensive.
After looking at some of the craftsmanship from some of our members, I think they could make a really nice unit for dirt cheap. I still think if you want safe, free heat in your cabin, this is the way to go. Remember to put a shut off valve to the heater core, or you will have heat in the summer also.
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Old 10-14-2011, 10:52 AM
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My goodness this sounds complicated. In fact its easy and straight forward. Red dot (bus heater) for heat while underway. Mine was mounted under the steps. A small electric heater (with tip over protection while docked). For water the small stainless marine type (engine while running, 120v while docked). I had that setup and it worked fine.
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Old 10-11-2013, 07:10 PM
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Default Bus heater

I purchased a heater craft core heater. Simple unit , small fan, coolant in coolant out. My problem is I do not know where to tap the coolant from. I have a cummins 6bta, 330 hp. Is there a plug on the engine or do I need to splice the hose to the heat exchanger??
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Old 10-11-2013, 07:15 PM
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You need in and out lines. I'd take the line going to the water heater if you have one, and splice into that.
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Old 10-11-2013, 07:38 PM
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Default Your cabin heater

http://store.hamiltonmarine.com/brow...075/4,220.html
This is the lowest BTU they make. You can get them bigger if you think you will need it. I have considered combining a potable hot water heater with this. You may need to add a circulating pump. I believe they have it as an option. Most likely you will need to install a return air grill with a filter too.
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Old 10-12-2013, 03:54 PM
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Quote:
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http://store.hamiltonmarine.com/brow...075/4,220.html
This is the lowest BTU they make. You can get them bigger if you think you will need it. I have considered combining a potable hot water heater with this. You may need to add a circulating pump. I believe they have it as an option. Most likely you will need to install a return air grill with a filter too.
Think that idea through a little more...
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Old 10-12-2013, 06:50 PM
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My Bayliner 3270 came from the factory with a wabatso heater that runs off the same loop as my hot heater feeds of the engine cooling. It will heat the cabin for several hours after we shut the boat down.
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Last edited by finz2right; 10-12-2013 at 07:19 PM.
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