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Old 10-14-2016, 01:40 PM   #1
Join Date: Jun 2011
Posts: 151
Question Fluid heating in floor using pex and the former heating system.

As with most buses mine has that water valve that is by drivers foot that sent water to the back heater. My 98 Ford B700 Thomas body has a very large pump up on the firewall to circulate the water.

Has anyone explored the idea of using the engine heat to heat the floor while the engine is running? Add a valve to switch from the engine to another heat source.
Former owner of a 1969 F600 Skoolie.

1998 Ford B700 Thomas body 65 passenger. 5.9 Cummins 12 valve with MT645 Ttanny 123,000 miles.
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Old 10-14-2016, 02:10 PM   #2
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Join Date: Feb 2015
Location: North carolina
Posts: 489
Year: 1986
Coachwork: Thomas
Chassis: Ford
Engine: Detroit 8.2
Rated Cap: 60 bodies
Yes that is a very versatile solution.
If you have an alternate heat source for your flooring that has its own pump when the bus is not running. If piped correctly your alternate source could be used to warm up the radiator,engine block prior to start up in the winter to help in cold places
Long story short? Yes it is very doable if your alternate heat source for the flooring is running the same ethylene glycol/antifreeze? Most commercial solar water systems use glycol to and from the panel's to heat various things?
Good luck
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Old 10-14-2016, 04:05 PM   #3
Join Date: Dec 2015
Location: Utah
Posts: 122
Year: 1990
Coachwork: BB
Chassis: TC2000
Engine: Cummins
Rated Cap: 25.999K
Radiant heat

I love the idea. I've seen it lots in homes. Most systems use it it pipes in cement because the cement transfers and holds the heat well. You wouldn't use cement, for weight. Maybe a passive solar box to heat? My neighbor has one to preheat his water in his house. It's just a back box with a clear lid, conduit running through it. I really like the idea of having an option to circulate through your radiator and block to keep it warm. Diesels can take a long time to get up to temp.
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Old 10-14-2016, 05:10 PM   #4
Join Date: Sep 2016
Location: Darrington, Wa.
Posts: 185
Year: 1994
Coachwork: Genesis/Am-Tran Tall Roof
Chassis: International, 643 transmission
Engine: DT 466ci 250hp, International
Rated Cap: 86 screaming Monsters
My parents Monaco has a diesel hot water circulation system to heat the floors and side compartments. It has real tile floors and real granite counters. Amazing how close they ran it up to the max weight. Id hate for some to get up a vacation day in the Schoolie and have there little toes go into shock from a chilled floor. Maybe some glow plugs in your socks would do a nice preheat.
Actually it works amazing and i diont believe they use any fans to move the air around so the pump is taking about the same load as the forced air would.
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Old 10-14-2016, 05:14 PM   #5
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Join Date: Nov 2010
Location: Andrews,Indiana
Posts: 1,390
Year: 1991
Coachwork: Bluebird
Chassis: AARE
Engine: 3116 Cat 250hp
Rated Cap: Her, me and Molly
I have in floor hot water radiant heat. Heat source is engine while running and Espar boiler when not running. There are pictures and some explanations throughout my build and there are some pictures on my web site. Also supplies domestic hot water.

From build site starting about here

Some pictures from my web site here. I see I haven't updated lately.
Diagram here.
Heat 2

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