Types of solar HWS: Forced circulation systems
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Solar hot water heaters can reduce your household carbon emissions by more than 20%, besides cutting your energy bills drastically. Choosing a style of solar hot water heater can be quite tricky, and it's a great idea to get a solar professional to work through your options. However, here's an explanation about forced circulation systems (mains pressure pumped).
The main difference here is that the tank is below the collectors - usually on the ground. Because the tank isn't above the collectors, the cycle of hot water rising and cold water being pushed into the collectors can't happen naturally - this means that a pump is needed. Pumps aren't expensive to run.
You would usually choose this type of system when your roof isn't structurally strong enough to hold the weight of the system. Usually, this system is boosted by electrical or gas heaters.
If this type doesn't sound right for you, check out the other types of solar hot water systems.
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