Nitrous Oxide Bottle Heater, 1-20 lb. Bottles, 12 V DC, Pressure Controlled, Kit.  These ZEX nitrous bottle heaters thermostatically raise the bottle pressure, when necessary, by applying heat to the nitrous bottle. Consistent bottle pressure (900-950 psi) is very critical for the proper operation of your nitrous system. Use one of these heaters to increase consistency and optimize performance each and every run down the racetrack.