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tlwcs

  • Posts: 2164
Hot water users, coolant maintenance
« on: July 31, 2025, 07:24:15 am »
Do you guys have to top it up or replace it
Thanks. 
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dazmond

  • Posts: 24460
Re: Hot water users, coolant maintenance
« Reply #1 on: July 31, 2025, 07:40:01 am »
Quote from: tlwcs on July 31, 2025, 07:24:15 am
Do you guys have to top it up or replace it
Thanks.

I vacuum mine out with a wet n dry vac every few years and replace with fresh. I also have to top it up occasionally(no more than just over a half full tank)
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price higher/work harder!

Scottish Cleaning Service

  • Posts: 758
Re: Hot water users, coolant maintenance
« Reply #2 on: July 31, 2025, 09:09:26 am »
I still have the same stuff in mine since new. Top up with good quality coolant for VW,s.
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Perfect Windows

  • Posts: 4321
Re: Hot water users, coolant maintenance
« Reply #3 on: July 31, 2025, 10:49:34 am »
Quote from: tlwcs on July 31, 2025, 07:24:15 am
Do you guys have to top it up or replace it
Thanks.

I'm interested in what the question means. Is coolant required for hot water systems? Why? What does it cool?

Vin
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Splash and dash

  • Posts: 371
Re: Hot water users, coolant maintenance
« Reply #4 on: July 31, 2025, 02:03:48 pm »
Yes change it every couple of years the same as you would on the car or van , we use a 50/50 mix using the red long life antifreeze
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tlwcs

  • Posts: 2164
Re: Hot water users, coolant maintenance
« Reply #5 on: July 31, 2025, 02:43:42 pm »
Quote from: Perfect Windows on July 31, 2025, 10:49:34 am
Quote from: tlwcs on July 31, 2025, 07:24:15 am
Do you guys have to top it up or replace it
Thanks.

I'm interested in what the question means. Is coolant required for hot water systems? Why? What does it cool?

Vin

Mate, it’s magic as far as I’m concerned and I don’t know either.
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Jonny 87

  • Posts: 3513
Re: Hot water users, coolant maintenance
« Reply #6 on: August 01, 2025, 07:31:43 am »
Webasto heaters can’t heat water, they heat coolant.

Coolant reservoir,
Heat from the diesel burner,
Coolant is pumped through a heat exchange plate,
Water is pumped through the other side of the heat exchange plate and the coolant heats the water.
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Vision Technician / Visual Engineer /  Vision Enhancement Operative /...........................................................OnlyUseMeWFP AkA Jonny the Windy Wesher

Splash and dash

  • Posts: 371
Re: Hot water users, coolant maintenance
« Reply #7 on: August 01, 2025, 05:10:53 pm »
Quote from: Jonny 87 on August 01, 2025, 07:31:43 am
Webasto heaters can’t heat water, they heat coolant.

Coolant reservoir,
Heat from the diesel burner,
Coolant is pumped through a heat exchange plate,
Water is pumped through the other side of the heat exchange plate and the coolant heats the water.


The coolant is 50% water so it does heat water😂😂
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Perfect Windows

  • Posts: 4321
Re: Hot water users, coolant maintenance
« Reply #8 on: August 01, 2025, 08:18:34 pm »
Quote from: Jonny 87 on August 01, 2025, 07:31:43 am
Webasto heaters can’t heat water, they heat coolant.

Coolant reservoir,
Heat from the diesel burner,
Coolant is pumped through a heat exchange plate,
Water is pumped through the other side of the heat exchange plate and the coolant heats the water.

Thank you - very clear.

Vin
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