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Not a straight forward exercise given that i have very little detail but here are some figures based on assumptions;
At 3,500 hours a 14kw boiler is going to produce 49,000kWh running at full
power
This equates to £2170 in RHI. This is because most of the payment is in the
tier 2 tariff of 2.1p
I would never suggest to run a smaller domestic boiler for this amount of
hours in a year. They are much more delicate than the larger systems.
If the requirement is 49,000 kWh then I would suggest a boiler of 30kW
output. Approx 1633 hours of use. This would generate £3473 in RHI
payments. This is because much more of the operation hours is in the Tier 1
payment of 8.3p.
Hope that helps.
All interesting info. Whats the cost of the 30kw set up? Thanks.