Heater Craft Circulation Pump Retrofit Kit Black Friday This all new 4'5" compression molded board This all new 4'5" compression molded board features a large planning surface and a thinner cross section similar to a wakeboard That means this pump can be threaded directly into your ball valve or other inlet hardware with no adapters and no special sealant for a leak proof installation Typically the heater blower unit is mounted in a location not in close proximity to the boat’s engine which supplies the hot water to the coil A common mounting location for the heater where this might be an issue would be under the driver’s helm or in the observers compartment