Reply
 
Thread Tools Display Modes
 
Old 06-07-2017, 07:53 PM   #1
Mini-Skoolie
 
Join Date: Nov 2016
Posts: 25
Using a tankless water heater to heat bus through original bus heaters.

I have an idea. How about using a tankless water heater to heat water to circulate through the original bus heaters. This way, the engine doesn't have to run to get heat. And less engine coolant to contend with.
You could set up a pump to circulate the water and use the original fans to push the heated air.
You could also move the heaters to a more convenient place in the bus.
You could attach a thermostat to the pump to start and stop when You need heat.
Lonejack is offline   Reply With Quote
Old 06-07-2017, 08:18 PM   #2
Bus Geek
 
Robin97396's Avatar
 
Join Date: Feb 2016
Location: Willamina, Oregon
Posts: 6,409
Coachwork: 97 Bluebird TC1000 5.9
That's what's nice about the tankless water heaters. They automatically maintain the temperature they are programed for. Some people do put in a dedicated tankless water heater and pump to circulate coolant from the engine. There's as many variants as people can think of.

Using the bus fans would work to distribute heat but might be a drain on the 12 volt system overnight. More efficient motors and fans can be used.

Good thinking, but you're not the first.
__________________
Robin
Nobody's Business
Robin97396 is offline   Reply With Quote
Old 06-07-2017, 08:22 PM   #3
Bus Crazy
 
Njsurf73's Avatar
 
Join Date: Jan 2017
Location: Massachusetts
Posts: 1,497
Year: 2002
Coachwork: Bluebird
Chassis: Bluebird
Engine: 5.9 Cummins 24v
Rated Cap: 72 pax
Would there be an issue running antifreeze in the tankless heater? Or would water in the heater cores be a bad idea? I like this idea. I hadn't thought about it, but it is a pretty good idea.

Sent from my XT1254 using Tapatalk
Njsurf73 is offline   Reply With Quote
Old 06-07-2017, 08:35 PM   #4
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 11,630
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
there are models of tankless heaters that are designed to have boiler loops and domestic loops.. if you are going to run a closed loop system and not run the coolant through the engine as well then you'll need expansion tanks, blow-offs and the like.. if you are just connecting to the bus coolant system, you will also be heating your engine as well and a small amount going to the radiator as most thermostats have a small bypass on them to keep air from building up under them...
-CHristopher
cadillackid is offline   Reply With Quote
Old 06-07-2017, 09:25 PM   #5
Mini-Skoolie
 
Join Date: Nov 2016
Posts: 25
Friend Christopher,
All You would need would be a small expansion tank with even a radiator cap for a pressure relief. When I was working @ Freightliner, the small engines, (Cummins 5.9 and 8.3,) used an expansion tank separate from the rad as a fill pressure relief, with a radiator cap. It even had a low water level site glass.
This could be placed at a high point in the system for maintenance.
Because the system would be completely within the bus, antifreeze would not be necessary, except some form of coolant treatment would be necessary to avoid corrosion of the heater pipes.
Lonejack is offline   Reply With Quote
Old 06-08-2017, 04:38 PM   #6
Bus Nut
 
Join Date: Jul 2014
Posts: 716
Year: 1998
Coachwork: Bluebird
Chassis: TC2000 RE
Engine: 8.3l Cummins
Rated Cap: 78
This is common. Use a unit that's designed for that task though.

Planar Heaters. Hydronic Heater 14TS-Mini-12 (-24)

Eberspaecher - Hydronic S3 Economy, Automotive Heaters

https://www.webasto.com/us/markets-p...r-top-2000-st/



Quote:
Originally Posted by Lonejack View Post
I have an idea. How about using a tankless water heater to heat water to circulate through the original bus heaters. This way, the engine doesn't have to run to get heat. And less engine coolant to contend with.
You could set up a pump to circulate the water and use the original fans to push the heated air.
You could also move the heaters to a more convenient place in the bus.
You could attach a thermostat to the pump to start and stop when You need heat.
aaronsb is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 07:43 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.