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Old 11-15-2019, 12:30 PM   #121
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Originally Posted by o1marc View Post
Don't they only use the bus fuel for power, it's not connected to the motor?



Correct, the AIR HEATERS dont touch anything but the fuel tank.. a coolant heater can be plumbed in so it circulates through the engine coolant loops..

or it could be used closed-loop with its own expansion tank and circulate just through its own dedicated heater coils if you wish...



-Christopher
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Old 11-15-2019, 12:34 PM   #122
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I would be leary of plumbing a 'cheap' unit into my buses engine -- I wouldn't want anything that could damage or reduce the reliability of my engine...
Y-fitting to the engine coolant. If the pump to the radiant heat dies, the coolant is still going to take the path of least resistance which would be thru the radiator and engine block. Worst case the cheap one explodes and you have a coolant leak. The RE bus to the front defrost is a hell of a lot of coolant. If you spewed enough the engine runs dry and didn't notice, it's because you're already a zombie and just don't care.


My bus also has shut off valves where it comes into the bus from the engine. In summer those would be closed anyway.
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Old 11-15-2019, 12:36 PM   #123
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Originally Posted by cadillackid View Post
Correct, the AIR HEATERS dont touch anything but the fuel tank.. a coolant heater can be plumbed in so it circulates through the engine coolant loops..

or it could be used closed-loop with its own expansion tank and circulate just through its own dedicated heater coils if you wish...



-Christopher
Or a third loop with a heat exchanger for hot sink/shower water. That's my plan. I should probably start shopping for said exchanger.
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Old 11-15-2019, 12:40 PM   #124
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Originally Posted by Brewerbob View Post
Y-fitting to the engine coolant. If the pump to the radiant heat dies, the coolant is still going to take the path of least resistance which would be thru the radiator and engine block. Worst case the cheap one explodes and you have a coolant leak. The RE bus to the front defrost is a hell of a lot of coolant. If you spewed enough the engine runs dry and didn't notice, it's because you're already a zombie and just don't care.


My bus also has shut off valves where it comes into the bus from the engine. In summer those would be closed anyway.
He was referring to an "air" cooler, not a coolant heater.
My air cooler came with it's own tank, or plumb to bus tank. It was not expensive.
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Old 11-15-2019, 12:43 PM   #125
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Originally Posted by o1marc View Post
He was referring to an "air" cooler, not a coolant heater.
My air cooler came with it's own tank, or plumb to bus tank. It was not expensive.
Um, you can't plug an air heater into your engine.
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Old 11-15-2019, 12:43 PM   #126
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Originally Posted by o1marc View Post
Don't they only use the bus fuel for power, it's not connected to the motor?
The coolant heaters are plumbed into the engines cooling system and circulate the engines coolant through the system. This is good for over the road truckers who have instant heat/defrost when they start out after sleeping in their cab all night.

But cadillackid makes an interesting point that you could isolate the buses heater cores from the engine...

My preference is the propane gravity furnaces which take no electric power at all -- they are hard to find and less ideal for large spaces but was great in my 14' camper when I lived off-grid.
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Old 11-15-2019, 01:01 PM   #127
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I have seen, and am going to duplicate, a coolant heater plumbed in a manner that allowed you to select the heat source and destination. That way you can use the coolant heater to preheat the engine or to heat your interior or both.

While you are driving you can use either the coolant heater or the engine coolant to heat your interior.
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Old 11-15-2019, 01:11 PM   #128
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-Christopher
So, here's a question for you Chris. How many BTU/hr do I need for instant hot water for the shower? Below are a couple of random heat exchangers. One is meant for home brewing and the other has a rating in the name. I'm guessing my potable water is 50 on a cold day with the heat in the bus off or running low. Shower water is 104 give or take. The Webastco output temp is ...? I see BTUs on their data sheet but not temps.



No BTU/hr
https://www.amazon.com/gp/product/B0...CCQDKPZI&psc=1

280,000 BTU/hr
https://www.amazon.com/gp/product/B0...O3Q2HX8Y&psc=1
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Old 11-15-2019, 01:14 PM   #129
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Originally Posted by banman View Post
The coolant heaters are plumbed into the engines cooling system and circulate the engines coolant through the system. This is good for over the road truckers who have instant heat/defrost when they start out after sleeping in their cab all night.

But cadillackid makes an interesting point that you could isolate the buses heater cores from the engine...

My preference is the propane gravity furnaces which take no electric power at all -- they are hard to find and less ideal for large spaces but was great in my 14' camper when I lived off-grid.
I was replying to a post where YOU asked about Diesel "AIR" heaters, not "COOLANT" heaters.
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Old 11-15-2019, 01:15 PM   #130
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Um, you can't plug an air heater into your engine.
That was my point Bob.
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Old 11-15-2019, 01:17 PM   #131
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Originally Posted by PNW_Steve View Post
I have seen, and am going to duplicate, a coolant heater plumbed in a manner that allowed you to select the heat source and destination. That way you can use the coolant heater to preheat the engine or to heat your interior or both.

While you are driving you can use either the coolant heater or the engine coolant to heat your interior.
That's all valving and loops but also what I want.




Engine coolant on and diesel heater off, floor on... when driving to Alberta.

Engine off, floor off, diesel heater on, heat exchanger and hot shower ... in FL.

Diesel heater on, floor on, engine off, circulate thru engine block ... in Alberta.
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Old 11-15-2019, 01:21 PM   #132
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Originally Posted by o1marc View Post
That was my point Bob.
My Y fitting, which was supposed to be T fitting, comment was quoting a comment where he said he didn't want to mess up his engine. There are knock offs of both the air and coolant heaters tho there certainly seem to be a lot more air heaters out there than the coolant one.
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Old 11-15-2019, 01:42 PM   #133
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Originally Posted by Brewerbob View Post
My Y fitting, which was supposed to be T fitting, comment was quoting a comment where he said he didn't want to mess up his engine. There are knock offs of both the air and coolant heaters tho there certainly seem to be a lot more air heaters out there than the coolant one.
Why didn't you quote that post?
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Old 11-15-2019, 01:47 PM   #134
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Why didn't you quote that post?
I did.

Quote:
Quote:
Originally Posted by banman
I would be leary of plumbing a 'cheap' unit into my buses engine -- I wouldn't want anything that could damage or reduce the reliability of my engine...

Y-fitting to the engine coolant. If the pump to the radiant heat dies, the coolant is still going
Since you can't plumb an air unit into your engine, he must have been talking coolant.

Tho just to play devil's advocate now, I guess you could plumb an air unit into your engine with the right engine. I have a grid heater in my bus instead of glow plugs. I've no idea if the outlet of the diesel air heater would be enough to replace a grid heater tho. Might be interesting to find out if the grid dies and costs $600 when the air heaters are only $150 or whatever.
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Old 11-15-2019, 01:52 PM   #135
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I did.


Since you can't plumb an air unit into your engine, he must have been talking coolant.

Tho just to play devil's advocate now, I guess you could plumb an air unit into your engine with the right engine. I have a grid heater in my bus instead of glow plugs. I've no idea if the outlet of the diesel air heater would be enough to replace a grid heater tho. Might be interesting to find out if the grid dies and costs $600 when the air heaters are only $150 or whatever.
You quoted me on post #125

I doubt an air heater gets as hot as your grid heater.
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Old 11-16-2019, 03:29 PM   #136
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You quoted me on post #125

I doubt an air heater gets as hot as your grid heater.
How hot do his air heater and grid heater get?
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Old 11-16-2019, 03:37 PM   #137
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How hot do his air heater and grid heater get?
If I knew I would not use the word doubt.

Grid heaters run around 1200*, I doubt the air heaters are anywhere near that.
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Old 11-16-2019, 04:04 PM   #138
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If I knew I would not use the word doubt.

Grid heaters run around 1200*, I doubt the air heaters are anywhere near that.
Ok. The tone of your post led me to believe that you knew.

Apologies
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Old 11-16-2019, 04:11 PM   #139
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Ok. The tone of your post led me to believe that you knew.

Apologies
I was completely guessing, but my theory seems valid that it takes more temp to make a grid glow, than what it takes to heat air for the cabin. I commend thinking outside the box, but sometimes it's just unreasonable.
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Old 11-20-2019, 11:30 AM   #140
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I feel like I have seen people wire these to timers or thermostats for temperature control after noticing that the low setting is too high. Anyone tried this?
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