There is not a great lot of choice when it comes to oil heaters for swimming pools. The only heater worth considering is the Certikin Oil Heater shown above.
Oil as a fuel source is becoming less and less popular with swimming pool owners due the oil being so expensive to buy. But pool owners who live in rural areas with no gas supply don't have much choice but to use oil heaters.
Oil is not the only choice though. Heat Pump technology has moved on at a fast pace and many pool owners are installing heat pumps as the main heater and keeping the oil boiler as a back up for when the temperature drops.