It’s incredibly expensive to buy both a filter pump and heater pump, so why not combine the costs? Doing so will save you money & reduce your running costs! Simple to run and affordable for its entire lifetime – the EvoHeat J-Box makes complete sense! The J-Box allows either the heater OR the chlorinator to turn the water pump on so each device can run independently of the other. Conversely, the J-Box allows both the chlorinator and heater to be running at the same time.