Posts Tagged ‘solar hot water split system’

A solar hot water split system only has the panels on the roof. The tank is on the ground in the same position that the old tank was in. That is the main difference of solar hot water heating systems.

Hot water rises up because it has less density than cold water. That means that a pump is necessary to pump the cold water up into the panels on the roof at the same time drawing the hot water down into the tank.

The pump is located on the tank. It is managed by a computer that measures the temperature in the panels and in the tank. Whenever there is a 6 degree Celsius difference (i.e. the water in the panels is 6 degrees warmer than the water in the tank) the pump starts working.

Two reasons for that:

1. You do not want to circulate the water at night or under clouds when there is no sun to heat the water in the panels
2. You want to use the heat as soon as the sun is hot enough, so even a 6 degree difference can make it difference.

But the water in the panels can get a lot hotter. That’s why the pump also stops working when the water in the tank has reached 75 degrees Celsius. That is much hotter than any electric hot water heater (they heat to around 60 degrees).

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