From Aqua-Hot Heating Systems, the leader in hydronic heating systems for the RV industry for over 25 years, comes the innovative Aqua-Hot 100 Off-Road Heater. Connecting to an engine’s cooling system, the compact unit quietly and efficiently heats cabs with a brushless, radial axial fan. The economical Aqua-Hot 100 draws less than 0.5 amps, ensuring long hours of warmth without draining the battery. Delivering big heat from a small package, it weighs only 3 1/2 lbs. and measures 5 1/2 inches high, 5 1/2 inches deep and 9 1/2 inches wide. A tough, high-strength nylon housing resists harsh elements and challenging environments. An adjustable mounting bracket rotates 180 degrees for easy installation to the floor, firewall or under dash. Slotted mounting arms and a serrated clamp ensure a tight fit. An integrated, variable-speed switch reduces wiring and enables the fan to be set from 0 to 100 cfm. It carries a one-year warranty. MSRP: $189.99. For larger cabins where more battery power is available, the Aqua-Hot 200 provides a fan output of 0 to 200 cfm and draws just 2 amps. Convenient installation kits are also offered. Contact Aqua-Hot Heating Systems, 15549 E Hwy 52, Fort Lupton, CO 80621. (800) 685-4298 or (303) 659-8221; Fax: (303) 857-9000. firstname.lastname@example.org; www.aquahotoffroad.com.