Our customer had installed Solar panels in 2011 and wanted to utilise more of their surplus Energy. We installed a 16kW Daikin Altherma Heat Pump for space heating via Dimplex "smart" radiators. For hot water we indroduced Thermodynamics to heat a 250L cylinder - 24/7 365 days a year. Some of the running costs for the Heat Pump were offset by the existing Solar array and RHI subsidies meant the system would pay for itself within 6 years.
We were spending over £3,000 a year on Oil and switched (to be more environmentally friendly) to an Air Source Heat Pump. We offset the cost of running the Heat Pump with Solar PV. It's early days to see how much we are saving but we are earning over £1,000 a year in incentives and we are on the lower FiT rate for our Solar due to the age of the property.
Mr P