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What is the best renewable energy system...
On a domestic property A 4kW system can still return as much as £700 per year for 20 years. Payback can be within 6 years but payments from the Feed In Tariff continue for another 14 years. Meanwhile daytime electricity used is free.
The savings for solar thermal systems are approximately £180 per year with Renewable Heat Incentive payments of up to £375 per year for 7 years. Payback within 7 years. Again Solar Thermal will protect you against utility price increases
Costs about £500 per year to run but saves up to £600 in terms of gas consumption plus you receive payments (up to £850) from the Renewable Heat Incentive for 7 years.
Hybrid systems now available to run with conventional gas boilers
One panel can provide !00% of your hot water - 4 will provide central heating.
These systems do not rely on sunlight but work on the ambient air temperature. They do not qualify for the Renewable Heat Incentive yet but work 24/7 - 365 days a year. Payback on a domestic system is currently about 8 years based on the gas consumption savings. Indications are that this system will soon be eligable for the RHI and claims can be made retropectively.