We are looking at air-water heat pump options. One of those is to build an old oil fired Rayburn into the solution. The Rayburn is a Royal OF7 - very basic oil burner with a manual control. It currently ticks over on the lowest setting all year round, providing space heating to the room and enough hot water (gravity/convection system) for 98% of the year. Has anyone successfully designed an old Rayburn into a RHI-compliant heat pump system? If so, how was that configured with respect to controls?