Alde AB was founded in 1949 by the Swede, Alde Rask, manufacturing systems for cars and tractors. Alde central heating systems and hot water heaters for caravans, motorhomes, boats and welfare units, have been made in Sweden since 1966. With hydronic (wet) central heating systems gaining favour in the luxury market, Alde International Systems AB continue to grow and prosper internationally, manufacturing state of the art systems for caravans and motorhomes and boats.

How does Alde wet heating work?

Hot glycol and deionised water mix circulates around the system through radiators and pipes by means of a pump. The convectors that are placed along the outer walls heat the air. This then rises and heats the walls and furniture. Since hot air rises, an air barrier is formed in front of the windows, which keeps the chill off.

The Coolant/Glycol G13 is an ethylene glycol/glycerine based extended life antifreeze/coolant that combines the fast healing aluminum protection associated with silicate additives with the extended cooling system protection.

How often should the coolant/glycol be changed?

Generally speaking, if the Glycol colour in the expansion tank is BLUE then this should be changed every two years.

If it’s a PINK or PURPLE colour then every five years but this is just a rough guide.

After the above time scales the corrosion protection is greatly reduced and the internal workings of the heating system will start to corrode.

The mix of glycol and deionised water is 50-50 and only approved gycol by Alde should be used.