Hi Anthony and welcome.
Just put the heater in-line. If the magma has a female outlet just plug solution hose into that. Put your 50ft (male) into machine and put the male from the heater into the female on the hose. The heater is just like a hose, with a male inlet and female outlet. Heat alone will not remove all stains. If it's juice you may need a dye stain remover. Prochem red RX is ok, there are others that contain sodium metabisulfite (sod met) like Spray & Go by Chemspec. You really need some training to use these products. Cleansmart run courses with Derek Bolton, get yourself booked in mate. Get a loty of off cuts from a local carpet shop of various fibre types and mixes, stain them up, leave for a week and practice on those.