HELIOFRANCE self-draining glycolated solar water heater kit (300L tank + 1 or 2 sensor(s) + accessories)

Like any solar water heater, the basic principle is to heat the water contained in the tank by circulating a heat transfer fluid between the tank and the sensors when temperatures allow. The heat transfer fluid is water diluted in an antifreeze called glycol.

At Heliofrance, the water stored in the tank is always the same. It is possible to use rainwater to avoid scaling the electrical backup or the hydraulic exchangers in regions with very hard water.

This water in the balloon is used to store calories, it is called "dead water". It is at atmospheric pressure.
When there is a draw-off of domestic hot water, the cold water entering the tank passes into the domestic exchanger submerged in the hot storage water where it is reheated and then sent to the draw-off point.

The volume of stored domestic hot water (only that present in the exchanger) is therefore very low. Its quality is not degraded as it could be after too long storage.

The tank starts charging with solar calories when the temperature probe located on the sensors indicates a sufficient temperature and higher than the temperature of the storage water at the bottom of the tank. The circulator connected to the solar exchanger at the bottom of the tank then starts up and the water heats up.

When the tank temperature reaches its maximum value, the pump cuts out to protect the tank.

The 300L tank volume which includes a reserve of around 200L of water heated by hydraulic or electrical support when necessary is well suited to a family of 4 to 5 people.

The collector surface area of 2.7 m² to 5.4 m² must cover 50 to 80% of the household's domestic hot water needs depending on the consumption profile, the orientation and inclination of the collectors, the geographical area, any solar masks, etc.