I bought a home in November that has an in ground pool. I am new to this and I am a bit lost. I have just started the pool up for the year and I noticed a leek comming from the heater. I am going to have a tech come out to look at it but what I want to know is do NEED a pool heater? I have a spa and I would like to heat the spa but I live in TX (HOT)and I don't swim in the winter months so am I required to have a heater that can heat the pool and the spa even if I never use it to heat the pool?