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Our boat, At Last, already had an air conditioner with an reverse-cycle heater. However, the AC only works when connect to shore power. We wanted to add a diesel heater for heating while under way or anchoring out.
We purchased a Planar 44-D heater. The heater puts out up to ~13,000 BTU of heat, enough to heat a boat up to 40 feet (according to the brochure).
The kit came with all the needed installation hardware and with a fuel pump. I did need to purchase ducting to splice into the existing ducting, as well as exhaust pipe and the exhaust through hull. The kit came with a fuel tank but the design did not fit in the space, so I purchased a one gallon jerry can style tank.
I installed the heater in the aft cabin port-side locker. The previous owner had installed shelving in the locker--I removed the bottom shelf and cut a gap for the heater to fit. I mounted a board behind the heater to attach the shelf and the fuel pump.