FAQ

The glycol fluid has several important properties that both protect your heating system and ensure operation. The three main properties are:

• Antifreeze, protects the fluid in the heating system (not the fresh water) from freezing at freezing temperatures.
• Corrosion protection, lubricates and protects pipes and convectors.
• Bacteria protection, prevents bacterial growth in the heating system.

Never pour regular water into the expansion tank. If you use concentrated glycol, mix it with distilled water.

Never pour regular water into the expansion tank. If you use concentrated glycol, mix it with distilled water.

When the liquid is cold, the level in a normal-sized system should be about 1 cm above MIN. The larger the heating system, the more the liquid expands and the level should be lower when the system is cold.

It depends on the quality of glycol that the heating system is filled with. Glycol is a consumable and must be replaced before the protection (lubricating and anti-corrosion) expires. With a good quality glycol (such as Alde G12 EVO), it is sufficient to change every five years, while glycol of lower quality should be changed every two years. So it pays off in the long run to use a good quality glycol.

The Alde heating system is an open system with aeration in the filling/expansion vessel. By using an open system, the thickness of the material in pipes, connecting rubber and other system components can be reduced, which has a positive effect on the total weight of the system.

Alde recommends a glycol of quality G12 EVO. In our range there is a ready-mixed Premium Long Life Glycol adapted for Alde heating systems.

Should you not be able to get hold of the above, it should be a 50:50 mixture consisting of ethylene glycol and distilled water.

Ethylene glycol (aka monoethylene glycol, MEG and ethanediol) antifreeze that is also used in car engines and is sold through petrol stations, car repair shops, accessory stores, as a concentrate or ready-mixed.
Do not mix antifreeze containing silicates with antifreeze containing non-silicate treated OATs. When mixing concentrated glycol use only distilled water.