Bongo Fury

We exchanged a trailer to a full-blown Bongo camper with a webasto oil-heated water. It is very effective, heats the water quickly, in about 1 -2 minutes, you can set the water temperature, it is mounted under the car, inside there are only brass elbows through which you can probably flow heated water.

Separately and in a different place, we have a webasto heating the air. They are not connected to each other and have separate silencers.

During the inspection at the service station, it turned out that there is a small leak of red liquid from a pipe under the car.

My question is on what principle does such water heating work?

Can there be coolant in the circuit?

Hi
I am not sure if you have the same water heating system with the webasto heater, but their are some good youtube videos on these heaters as well as the Chinese imitation one, one video in particular describes using a water heater with the heater.

Power steering fluid and gearbox fluid is usually red in colour,
Possibly one of these. Top of the steering box itself, the top seal is a known leak spot.