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Old 05-04-2009, 12:35 AM   #11
Join Date: Apr 2009
Posts: 25
Year: 1995
Coachwork: Thomas
Chassis: Ford B
Engine: 5.9 Cummins Turbo D
Rated Cap: 71
Re: ? - I need a plan for hot water .

The only thing with the on demands I have looked at like the Marey I posted states something like 25deg increase in incoming water temp. And that might be 40-50deg.

But keep me posted on what you get and how it works. I am not too far from Colaw RV Parts and Salvage / so I think I am gonna go check them out and see what I could get a toilet and water heater for.
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Old 05-04-2009, 12:56 AM   #12
Join Date: Apr 2009
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Year: 1993
Coachwork: Amtran
Chassis: International Cornbinder
Engine: DT466
Rated Cap: 84
Re: ? - I need a plan for hot water .

I think if you slow down the water it will warm up more. Water comes out of the ground at my house at 56 degrees so it has to warm up quite a bit. I am going to put my water tanks under the bed so that should help too
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Old 05-07-2009, 11:27 AM   #13
Join Date: Sep 2008
Posts: 39
Year: 1993
Coachwork: genesis
Chassis: international harvester
Engine: DT466
Rated Cap: 84
Re: ? - I need a plan for hot water .

going to install a bosch aquastar 1000P-LP on demand water heater, hopefully it works good sort of like the marey but made by bosch, parts are a lot easier to get, plus serviceing should be easier, just my two cents.
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Old 05-08-2009, 07:59 AM   #14
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Join Date: Dec 2006
Location: downriver, detroit mi
Posts: 794
Re: ? - I need a plan for hot water .

i wonder how a coil of black plastic waterline on the roof would work for a solar heater, 100' coil of 1" is less than $40 at lowes.
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Old 05-09-2009, 07:50 PM   #15
Bus Nut
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Join Date: May 2009
Posts: 784
Year: 1995
Coachwork: Genesis
Engine: Detroit
Rated Cap: 14
Re: ? - I need a plan for hot water .

I know I'm coming in a little late on this thread, but hope to buy a bus soon and need to think about these things.

I like the idea of a tankless water heater, but was unaware of the pre-water temperature requirements. I don't want to go with a traditional water heater because of the constant energy consumption (be it gas or electricity) created through maintaining temperature.

BUT... why not combine the idea of a traditional water heater with tankless heater? Sounds silly, I know, but bear with me... Traditional heaters maintain water temperature through a combination of heating element and insulation. But a tankless system heats water "on demand" as it's flowing. Why not take an insulated tank (like a large xtreme cooler) and use it to store the water that will be pumped (or gravity fed) into the tankless unit when needed? The insulation will maintain "room temperature" that allows the tankless to produce the desired "hotness". A two tank system would bring cold water in from the source to a non-insulated tank that would then feed the super-insulated tank via thermal convection as the "warm" water achieves room temperature.

Alternately, if you live in sunny climates, I would suggest running lots of black-painted PVC pipes along the length of the roof to collect heat from the sun during the day. If you're in a colder climate, use greenhouse poly to cover the pipes and help trap the sun's heat. With this type of system, shower in the evening and you'll have the opposite problem of trying to keep the water COOL enough!

Just my crazy newbie ideas.
Any chance they might work?
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