I have had my pool for seven years. Everything is falling apart.

1. The automatic pool cover has developed cracks and letting water onto the top of the cover which prevents the cover from opening because of the weight.

2. The 3rd heater repair person just told me that my heater needs to be replaced. I have arthritis and cannot swim unless the water is quite warm.

a. What would be a good replacement gas heater? MY pool is 8' X 50" and is 5 feet deep at the deepest point.

b. I have an automatic clorinator which the pool people said tends to eat the heater. I have had the valve fail twice. What would be a better way to chlorinate the pool? A floater will not work because of the cover.

Thank you.