Fill In the Blue Boxes          
Email Address (for results) Cost of bill
Start date on bill
End date of bill 
Annual heating bill now   Existing heating type
Number of kWhrs of heat supplied into building   Samsung air source heat pump    
Approx building heat loss W   Vaillant air source heat pump    
System being installed
choose from drop down menu
    Is solar PV installed
    Run cost per annum new system run cost  
    Run cost saving p/a saving over existing system  
RHI estimate RHI p/a for 7 years
PV contribution to HP assumes a 4kW pv system South facing
Cost of installation input figure here
Payback  years
The RHI was launched on 9/4/14. RHI is only estimated with this calculator, the full calculation will be be done using the energy performance certificate. 
Ofgem states that "It will be misleading to quote these figures when estimating RHI" but "you may wish to use them to estimate savings for your customer.