Espar Water Heaters offer affordable preheating of engine to prevent cold starts, fuel, and hydraulic systems as well as supplemental cab heating without idling the vehicle. Compact, powerful and easy to install, these heating systems are connected to the vehicle’s coolant circuit and circulate warm air into the vehicle via the air outlets in the dashboard and provide efficient heating of small and large interior spaces, even under extreme conditions. click on image for product details.

​Hyrdronic S3 Series offers affordable preheating of engine, fuel, and hydraulic systems as well as supplemental cab heating without idling the vehicle. Units function like hot water furnaces, utilizing the vehicle’s own fuel and power supply to produce heat. The heater’s coolant pump then circulates the engine’s coolant to transfer the heat to the engine block. Applications include: trucks, off-highway equipment, boats, and buses. Units are easy to install and do not require electrical plug-ins.

Hydronic M-II series is powerful, compact, lightweight, and rugged in design. This series of heaters are ideal for providing engine, fuel, and hydraulic preheat for off-highway equipment as well as engine and supplemental cabin heat for motorcoachs and school buses. They are available in 1 size with 4 power levels and are diesel or bio-diesel compatible.

Hydronic L-II series is available in 1 size with 4 power levels for the largest coaches, boats and off-road engines. These heaters provide engine, fuel and hydraulic preheat and can be incorporated into a coaches heating system to provide supplemental heat   These large HYDRONIC pre-heaters can be boxed for protection against the elements and offer innovative amp management solutions utilizing our multifunction switch.

Espar Water heaters seamlessly integrate to the vehicle’s coolant circuit, they preheat the engine to prevent cold starts and provide warm air into the vehicle interior via the air outlets in the dashboard.
S3/B5/D5E SERIES

Hydronic M-II series is powerful, compact, lightweight, and rugged in design. This series of heaters are ideal for providing engine, fuel, and hydraulic preheat for off-highway equipment as well as engine and supplemental cabin heat for motorcoachs and school buses. They are available in 1 size with 4 power levels and are diesel or bio-diesel compatible.

M SERIES

Hydronic L-II series is available in 1 size with 4 power levels for the largest coaches, boats and off-road engines. These heaters provide engine, fuel and hydraulic preheat and can be incorporated into a coaches heating system to provide supplemental heat These large HYDRONIC pre-heaters can be boxed for protection against the elements.

L-II SERIES

Air distribution examples for Off-Road, OnRoad & Bus/Coach with the Espar coolant or water heater.