We are having an inground installed this spring. We had thought of getting an electronic gas heater, the Hayward H250. The pool builder has strongly suggested the millivolt model. He justified his suggestion by indicating that while electronic are easier to operate, the millivolt model is much easier to fix, repair etc. Basically he said the electronic model while nice, has more equipment that can go wrong and that if the electronic board goes it will be quite expensive to repair. So, while we had originally wanted an electronic heater, if there is an air of truth to his concerns, that would be enough to sway me. BTW, we have a gas stove that is electronically controlled. The board went and it cost us $800 to fix.