Gas Questions, Straight Answers
How do I know if a house is on natural gas or propane?
Tank in the yard or buried dome lid = LP. Meter on the wall = natural gas. It matters because orifices, regulators, and manifold pressures differ — running NG setup on LP over-fires the appliance. When converting, the kit is appliance-specific by model number.
Can I bury CSST or run it outside?
Follow the specific product's listing — most CSST can't be direct-buried without a sleeve and has bonding requirements people skip. The bonding clamp costs a few dollars; lightning damage to unbonded CSST costs a house. Read the manufacturer's install guide, not the forum summary.
Gas flex connector to the furnace, or hard pipe all the way?
An approved appliance connector at the unit is legal and normal in most jurisdictions — one connector, right length, no passing through the cabinet wall, drip leg where required. Local inspectors vary; when in doubt, hard-pipe the last run and nobody argues.
How do I size the gas line when adding a tankless water heater to a furnace system?
Total BTU of everything on the line, longest-run method, against the sizing tables for your pipe type and pressure. Tankless units are gas hogs — 150–200k BTU — and the #1 install failure is hanging one off a line sized for a furnace alone. Run the table before you quote.
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