Hydronic coolant

[andanotherthing]

Hi Ant,
I have another question I hope you can help me with; I have a 2006 hylo and I need to top up the hydronic coolant (?) on the Eberpacher heater. Which type of anti-freeze do I need to use?
regards,
Dan

[ant]

Dan.
I use Bluecol, but any glycol based antifreeze will do, make up a 33% mix ( 1 glycol to 2 water) fill the header tank to about two thirds. If the tank gets too low and air is allowed to get into the system the heater tends not to light.
Ant