onBoard Energy

Comprehensive range of calorifiers to marine specifications.


Constructed in grade 1 copper and pressure tested to 5 bar (75 psi), spray foam insulated (approx. 25mm) and all include a 2 ¼" immersion heater boss and fitting for pressure relief valve. Working pressure 35 psi.

Coils are 22mm ‘high recovery’ (fins for more effective heat transfer), feed and supply are 15mm.

All water fittings are spigots to ‘Speedfit’ or ‘Hep2o’. Fittings on vertical calorifiers are accessible on one side.

Please note that dimensions are for bare copper cylinder, please allow approx. 50mm for spray foam insulation.

OTHER SIZES AVAILABLE TO SPECIAL ORDER, 12",
14", 16" AND 18" diameter, height or length by request -