The majority of heaters do not require mounting, but if the boat will be used intermittently during the winter, the heater should be removed or permanently mounted. The heater may be mounted in any position. Use CUSTOMER supplied bolts, screws, rivets or any other suitable means. Take care not to screw through the bottom of the boat. Although the heater is waterproof, we recommend that it be mounted in an area that remains dry, as this will keep debris out of the fans and prolong the life of the heater. Complete submersion voids the warranty.