A very common hot tub heater assembly for the metal GL spa packs by Balboa.

Used on: Spaform SF172, Catalina, Aegean, Hydropool, Canadian Spa, Hydrospa, Duplex Value Pack, Marquis Spa, Leisurite, Super Duplex Pack, Leisure Bay, Signature Spas, Hot Tubs Direct 

Fitted with 12" M7 sensor technology to regulate spa water flow and temperature (Click HERE for Details)

Heater gaskets and split nut unions are also included making for easy installation and removal. 

Solvent weld sockets for 2" pipe. 

Fixed into place with 2 x metal straps

The heater comes complete with two M7 sensors, pre mounted at each end of the heater tube ready for connection to the control box. These sensors monitor each other using the onboard software to regulate the spas functions of water flow and temperature. This technology allows for a correct operating environment for the heater.  The sensors automatically adapt to the flow direction and detect restrictions including dirty filters.

This Balboa heater assembly is quick to install and allows for easy servicing and troubleshooting, due to the split 2" buttress thread unions with O ring. The union is ready to accept glued 2" pipework. 

Note: 
Always use an appropriate spanner or long nose pliers to hold the terminal base before tightening or loosening the 10mm terminal nuts.