You just selected:
Code Gecko
9920-100225
TRANSFORMER: 240V, M-CLASS-MP
You should also consider these companion products:
Code Gecko
510AD0249
PRESSURE SWITCH 2PSI (replaces 510AD0167)
Code Gecko
9920-100346
HEATER: HEAT.WAV, 4KW, 2'', 2PSI, M-CLASS