My pump room is approximately 90 feet away from the meter and is attached to my garage. I have an existing underground 1 inch gas line that is connected to my furnace in the garage. I'm in Canada and want to extend my pool season as much as possible. I have an 18 by 36 inground pool with no deep end. The pool has 90K liters or 24K gallons of water. I want to add a gas heater, what are my options?
I don't know the specific laws, regulations, and practices in the
Great White North, but I can tell you what happens down here in
The States. What size heater are you looking to install? Down here, 400,000 BTU/hr is the largest pool heater that can be installed in a residential pool. To put this in perspective, I have a 4300ft2 home, with 3 furnaces, commercial-grade gas cooktop, 2x 50-gal water heaters, gas fireplace, and outdoor gas kitchen. If I had every gas appliance in my house running full-out at the same time, I could not match the gas required to run my pool heater. These things suck
a lot of gas. For your size pool, you'll need the largest gas-hog you can legally install.
I have a 1" gas line running about 150' from my meter to my 400,000 BTU/hr pool heater. This is possible because I now have 2-stage pressure regulation: The 50 lb. service pressure is first dropped to 2 lb. pressure at my gas meter. The 2 lb. service runs to my pool heater, where it is dropped to the required 7 oz. pressure. The 2 lb. pressure supplies enough gas for my heater to run correctly.
The easiest thing for you to do (if possible/practical) would be to supply your garage furnace with 2 lb. service and extend that same line to your pool heater, but you'd need to have step-down regulators at both garage and pool.