How many people can a 50-gallon tank with an 81-gallon first-hour rating serve?

It suits a household of about three to four people. The 81-gallon first-hour rating covers several showers plus laundry or dishwashing in the same hour, and the 41 gph recovery rate refills the tank steadily.

Does this heater meet Low NOx requirements?

Yes. State lists the GS6-50-BRT as meeting Low NOx emission requirements, which matters in districts that regulate nitrogen oxide from gas appliances.

What venting does it need?

It is an atmospheric vent unit, so it needs a vertical flue and adequate indoor air for combustion. It is not a direct-vent or power-vent model.

How is the tank protected from corrosion?

It has a Blue Diamond glass lining, a stainless steel CoreGard anode rod and a self-cleaning dip tube. Together they limit the corrosive effects of water and sediment.

Can I install it myself?

State sells ProLine heaters through professional wholesalers and contractors, and a gas appliance install involves the flue, gas line and relief valve. Plan on a licensed plumber or contractor.

How does it compare with a condensing or heat pump water heater?

Those units are more efficient than this atmospheric model's 0.62 Energy Factor, but they cost more upfront and often need different venting or space. This one is a straightforward like-for-like replacement for a standard 50-gallon gas tank.