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Different Types Of Solar Hot Water Heaters

Elvis Elvis

Heating water for domestic use with solar power is definitely an option if u are looking to save cost. The heaters can also be used for internal heating of your home or to heat a swimming pool.

There are a few types of solar hot water heater configurations and sometimes it may be real confusing.The water can be heated directly or indirectly and the system can be passive or active!

So, there are basically four configurations and the type of system you may want to use depends on a few factors.This include cost, availability of electric power – active systems require electric power and passive systems may include electric power – depending on your choice, and if you want to build it yourself.

The systems

1. Active open loop system.

This system uses an electric pump to circulate the water and it heats the potable water directly.

Different Types Of Solar Hot Water Heaters

2. Active closed loop system.

It also uses a pump but heats the water indirectly through a coil of tubes mounted in the hot water storage tank.

3. Passive open loop.

It does not make use of an electric pump but rather circulate the water making use of convection.It heats the water directly through the solar panels and then stores the water in a storage tank.

4. Passive closed loop.

Also not using a pump , heats the water indirectly through a coil of tubes mounted in the hot water storage tank.

Closed loop systems are used in areas where ambient temperature drops below freezing point.It uses antifreeze liquid in the coiled tubes to prevent freezing of the system during cold spells.

If the water freezes in an open loop system it can cause the tubes to burst and obviously no antifreeze can be used as the potable water is heated directly.

With all the systems above an electric element to heat the water may be added to the storage tank. This will ensure hot water on rainy days or during the night. This addition makes it less cost effective – but it has become standard practice to include this in the design. The system as a whole could still save as much as 70% on the cost of heating the water!

Open loop systems are the simplest to design and construct. They have no moving parts and may last longer and requires less maintenance.