Hayward ASME Heater, 250,000 BTU, Natural Gas, Induced Draft, Low Nox

Hayward model #H250FDNASME. Universal H-Series Digital Low NOx Pool Heater. Natural Gas, 250000 BTU, 110/220-Volt, 60 Hz, 1-Phase, Cupro Nickel.|Patented cupro nickel finn plate heat exchanger with bronze header as standard|Independent left or right side electric, water and gas connections|ASME pressure relief valve included as standard|Easy installation and service via access of single front panel|Easy dual voltage conversion with fuse-protected circuit boards