Will it last as long as a gas heater?

Life expectancy

The average solar system will last 15 to 20 years (double that of gas, with servicing running from nil to heavy, depending on the type of design. A Heliocol solar system will last beyond 30 years.

In my case, I've saved $40000 in fuel ($2000 a year to heat my 18' x 40' inground pool), and roughly $9000 or $10000 in replacement heaters which last only 8 to 10 years. I've saved almost $50000 over 20 years, and expect to save another $23000 over the next 10 years.

A Heliocol solar system will cost between $3000 to $5000, and $300 for maintenance over the next 30 years! Over the lifetime of a Heliocol solar system, you are likely to purchase from 2 to 6 new cars! Go for value, rather than price at all costs.