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post #11 of 33 Old 08-07-2008
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Propane is safe if you respect it. Always have a window open for any fumes to escape and test your equipment. Like Killarney said, no need to have it open when not is use. I'm more scared of a flash fire than of carbon monoxide on a boat.
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post #12 of 33 Old 08-07-2008 Thread Starter
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Quote:
Originally Posted by RickQuann View Post
Hartley,

Instantaneous hot water heaters are okay, but not really applicable to your application. The amps or btus requirements are too great and the amount of hot water is limited.

Try Johns advice; solar shower or stovetop
A mix of solar shower and stove-top is what we use now, and I agree that electric is probably not the way to go.

I've seen some LPG-powered catalytic space heaters and was wondering if that sort of thing was available for heating water - I'm not thinking just on our current boat, but future ones also.

Surely the CO problem can't be worse than using the stove?!?

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"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
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post #13 of 33 Old 08-07-2008
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I'd second using a solar shower. On hot summer days, with a black solar shower, the water can actually get hotter than is comfortable to use.

Propane on-demand hot water heaters are dangerous and can be a serious CO poisoning risk.

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post #14 of 33 Old 08-07-2008
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Quote:
Originally Posted by Hartley18 View Post
We all know that the usual method of getting hot water on a small(ish) yacht is from the engine cooling circuit and a small reservoir - but that seems to me to be a complex waste of valuable storage space given the number of times you actually need hot water when sailing.

Has anyone perfected "instantaneous" gas, electric or something else hot water systems that would be suitable for use on a small boat??

Just curious..
On the Womboat we use the stove. She does have an enclosed head with shower (cold, foot pump) with sump etc so what we have done is buy one of those 12v shower pumps from Whitworths. Boil kettle of water, throw it into a bucket in head sink, add couple of buckets of cold and away you go. Works well. Not great pressure but OK, gives you exact check on water usage.

Were thinking of making a new one with better pressure but would need to see how much water was being used. I hate having to pull in all the time to fill up tanks. Boring.

At the Sydney Boat Show there was a mob flogging a system that looked OK to me but their blurb is still sitting in the boot of my car. Let you know later.

ps - How's winter in Melbourne going ?

ps - the Coleman thing will work on a boat with decent ventilation. No gas lines so relatively safe on that level. I find it somewhat bulky and if memory serves me right it uses a disposable gas cylinder which I do not like.

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Last edited by tdw; 08-20-2008 at 06:44 PM.
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post #15 of 33 Old 08-07-2008 Thread Starter
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Thanks, TD.

Quote:
Originally Posted by tdw View Post
ps - How's winter in Melbourne going ?
Bloody freezing!! ..but a nice sunny day today.

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"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
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post #16 of 33 Old 08-09-2008
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Quote:
Originally Posted by Hartley18 View Post
Thanks, TD.



Bloody freezing!! ..but a nice sunny day today.
Bit chilly up here as well. To make matters worse i'm gedding a dold in de hed.

Have a look at this....Aus J Imports.......

I havn't had a good look at efficiency yet. Be interesting to see how it stacks up but given that I can shower on board using two litres of near boiling water (plus around four litres of cold) then a five or ten litre tank for the two of us should be more than ample instead of the what...40 - 50 litre tanks seen on boats with hot water storage tanks. Ok so it has to be the old navy shower routine but that is surely one of the prices we pay for living on a boat away from a marina berth. I suspect you could also improve the efficiency of these things by running the cold water through an heat exchanger. even in the relatively cramped head of Raven I could easily find room for the 5 litre and probably the ten.

ps - ref the two of us......me and Ms Wombat in case I had you worried.

pps - the smallest HW tank I've seen available is 24 litre and runs only on mains or engine power. To my mind that means you either waste hot water or use more than you you really need to.

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Last edited by tdw; 08-09-2008 at 07:47 PM.
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post #17 of 33 Old 08-09-2008
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You want hot water in less than the 4 SF a hot water heater takes? Plus of course a few hoses to get it there. A little spoliled are we in using ALL that space? Use the instant stuff and die or use 4 SF? Big question, easy answer!
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post #18 of 33 Old 08-09-2008
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hmm................
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post #19 of 33 Old 08-10-2008
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Quote:
Originally Posted by tommyt View Post
You want hot water in less than the 4 SF a hot water heater takes? Plus of course a few hoses to get it there. A little spoliled are we in using ALL that space? Use the instant stuff and die or use 4 SF? Big question, easy answer!
Oi, get your effing facts straight before you start dumping on me OK ?

To begin with , I am NOT talking about instant, so you are arse about face on that to begin with.

The mob I linked to have storage type systems that are 5 or 10 litre, instead of the the four sq ft jobs you are on about that are from 24 litre and up. Electric 12v or 240v NOT gas. Read my post.

First up our current boat is a 34'er and an older style 34'er at that, meaning far less interior space than more modern designs.

We shower now using the stove to heat the water and shower quite happily in approx 6 litres of water per person.

To install a more typical storage tank (4 sq ft minimum) means taking up valuable storage space and as you say running water pipes through the boat. All that in order to provide more hot water than we actually need.

The system I looked at we can install in the head far more easily that having to install something larger in cockpit locker for example. Indeed there is an unused space in the head that would be damn near perfect.

If we had a larger boat, different story, but right now we don't. Space matters and with limited water tankage so does water usage. OK , so if we had twice the tankage and an extra ten feet of boat, different story.

Big Question ? Maybe.

Easy Answer ? Maybe that as well.

So how come you missed by so far ?

sheesh.

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post #20 of 33 Old 08-10-2008 Thread Starter
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Quote:
Originally Posted by tdw View Post
pps - the smallest HW tank I've seen available is 24 litre and runs only on mains or engine power. To my mind that means you either waste hot water or use more than you you really need to.
My thoughts exactly - thanks, TD

Spa heaters.. never thought of that! Thanks for the link.

I know you weren't talking instant, but the instant unit they do have clearly states: "No standing pilot Ultra low water pressure start IC water control device No Electrical hook up 12000 Watt - Heat Output ( 40,946 Btu /hr ) 20-min timing shut-off to avoid CO toxicosis accidents."

If you ever needed more than the 10-litre 12V 25A dual-voltage electric one, the gas one seems purpose-built for boats.

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"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
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