For the full breakdown, see our best 12V Heater For UTV guide.
A coolant heater borrows warmth from the radiator loop, so the only electricity involved is the blower fan. Get the BTU range and hose fitment settled, and the electrical side is nearly an afterthought.
UTV Cab Heater Sizing: What Decides The Number
Heat output, airflow, and hose fitment decide the size; wattage only rates the blower on coolant kits. A buyer’s guide sets roughly 3,000 to 4,000 BTU/hr for a small cab and advises stepping up for larger cabs, leaky doors, or extreme cold — a starting point, not a target.
The two designs size differently. Coolant units plumb into the engine’s cooling loop and are rated in BTU/hr (a full-size kit can list 14,600 BTU/hr and 180 CFM). Electric air heaters make heat from a 12V element, turning the watt rating into the heat rating. Coolant kits fit only liquid-cooled machines; an air-cooled side-by-side needs an electric air heater or 12V seat heater. Fitment separates afternoon installs from ones stalled on a missing tee. Our tested picks for a 12V UTV heater lay out which units ship with the tees and hardware your coolant lines require.
How Many Watts Does A UTV Heater Blower Pull?
Kolpin’s UTV cab heater system manual lists those figures for low and high fan speed.
| Spec To Match | Typical Number | Why It Matters |
|---|---|---|
| Minimum heat output, small cab | 3,000–4,000+ BTU/hr | Starting floor for a tight two-seat cab |
| Full-size coolant unit | 14,600 BTU/hr | Shows the output a big kit can reach |
| Blower airflow | 180 CFM | Pushes that heat through the cab |
| Blower draw, low speed | 1.4 A at 13.5 V | About 19 watts of electrical load |
| Blower draw, high speed | 3.7 A at 13.5 V | About 50 watts at full fan |
| Electric air heater example | 180 W, 15 A | Here watts are the heat rating |
| Coolant T-fitting sizes | 5/8 in, 3/4 in, 1 in | Measure your hose before ordering |
| Mounting angle | Level, ports slightly high | Keeps air from collecting in the core |
Hose Size, Mounting, And The Install Order That Works
A loose mount or wrong hose tee ruins more installs than undersized heat output. Measure your coolant line diameter first, bolt the unit to solid structure, and bleed the system fully.
- T-fittings ship in 5/8 in (16 mm), 3/4 in (19 mm), and 1 in (25 mm); measure the hose you plan to cut.
- Mount level, or ports slightly high, so air can’t collect in the core.
- Thread hoses through firewall grommets, clear of exhaust heat, sharp edges, and moving parts.
The order matters as much as the parts:
- Park on level ground; let the engine go completely cold before opening the cooling system.
- Drain or catch enough coolant to cut into the lines.
- Cut the designated hose and install the supplied tees.
- Bolt the heater to solid structure, clear of pedals, steering, and moving parts.
- Run hoses through a grommet; secure away from heat and pinch points.
- Tighten every clamp, then walk the loop again. Arctic Cat’s kit instructions call for that second check because coolant leaks are the most common install failure.
- Refill, bleed the air out, run to temperature, and watch for drips.
You’ll know it worked when vents push warm air within minutes, the reservoir holds its level, and every fitting stays dry through a full heat cycle.
FAQs
Does A Coolant Heater Put A Big Load On The Electrical System?
No. The core gets heat from engine coolant, so the only electrical demand is the blower fan, in the single-digit amp range at 13.5 volts. Machines needing a hard look at charging capacity run electric air heaters, which turn watts directly into heat.
How Much Heater Output Does A Four-Seat Side-By-Side Need?
More than a small two-seat cab, and noticeably more if doors or roof leak. The 3,000 to 4,000 BTU/hr range targets smaller, tighter cabs. Longer cabs and soft tops lose heat faster, so pick a unit with headroom above that floor.
Why Does A Newly Installed Cab Heater Blow Cold Air?
Trapped air in the cooling system is the usual culprit. An air pocket stops coolant circulating through the core, so vents stay cool no matter how long the engine runs. Bleed the system until the level settles, then check fittings and clamps for a small leak.
References & Sources
- Kolpin. “UTV Cab Heater System Instructions” Documents low and high fan amp draw and coolant T-fitting sizes.
- Arctic Cat. “Cab Heater Kit Instructions” Covers clamp re-checking and leak testing after installation.