Bought home in SWFL to use as a vacation home rental. Replaced all equipment with AquaCal SQ110, Hayward VS pump and a Ecofilter with Zeolight. Tying to find a simple solution to turn on and off the heater as well as turning up and down temperature. I need to be able to lock out the heater when renters are there and choose not to heat the pool. Is the IAqualink a DIY type system, and if so, what are the parts I need to complete this process.