When winter hits hard, this Zerostart heater is your best friend! Pumping out 17,500 BTU per hour, this beast will keep your cab and cargo area toasty warm no matter how cold it gets outside. Running on 12 volts, it's perfect for trucks, vans, buses, and off-road equipment where you need reliable auxiliary heating. The compact design means you can fit it in tight spaces, and that built-in grill protects the heater core from damage. What's really cool is the isolated air flow system - no more losing heat through vents before it even reaches you! Uses way less battery power than other secondary heaters, so you don't have to worry about draining your power source. With 5/8 inch inlet/outlet diameter, it hooks up to your existing systems pretty easily. Whether you're a long-haul trucker, delivery driver, or just need reliable heat for your work vehicle, this heater delivers consistent warmth when you need it most. No more freezing while waiting for your main heater to catch up - instant comfort at the flip of a switch!