Plumbing · P-WHND8

Tankless Gas-Fired Water Heater Piping Diagram

Elements

Floors / Slabs Drainage Connections / Plates

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Twin tankless gas water heaters are connected to a natural gas line fitted with a gas regulator, aquastat timer, and isolation valves. The cold water supply line includes a pressure gauge, check valve, and recirculating pump with a balancing valve, tying into the heaters through dielectric unions and flexible connections. A temperature and pressure relief valve is installed on each unit, and the exhaust and intake ducts are routed with a quarter-inch rise per foot run. Condensate piping routes to the nearest floor drain, terminating with an air gap and including a condensate neutralizer kit.

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