Anyone have any pool heater info they wanna share with me?

Wifey has been lobbying for a heater and is armed with her mother's
chequebook. In the interest of staying married I've caved in and decided
that a heater might be a good thing for our kids... I just agreed to this
15 minutes ago, so haven't Googled anything yet.

Pool dimensions are 16 x 32 x 10 feet deep (3 feet at shallow end).

Ontario Canada. Typically our water is heated by the sun to 23 or 24,
which I think is 76F. In hot days it can get to 80F. Want a heater that
will give us 29 to 30 which I think is 85F but if not, at least to
maintain 80F.

Natural gas. Chlorine, Sand filter.

One other question, are these things power vent or pvc exhaust or are they
stack exhaust? Want to keep indoors but wonder about air breathing.


*I have a few customers with pool heaters and most of the time they don't
use them except for parties due to operating costs. I have heard that
painting the bottom of the pool black will help boost the temperature
slightly. One customer has an array of solar water heater panels (More like
mats) on the lawn next to the pool, but I don't know how well it works. As
with anything that is heated, including your house, you need to minimize the
heat loss to keep the expense down. You already have a cover to help with
this. All of the gas heaters that I have seen are outdoors near the pool
pump.