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Hydronic M-II 12 (42,000 BTU)

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Your Price:
$2,888.00 (You save $509.99)
Due to the complexity of ordering and shipping, please call 206-548-1306 to place an order.
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Product Description

The Espar Hydronic M-II series of heaters is powerful, compact and light weight but rugged in design making it ideal for for providing engine, fuel and hydraulic pre-heat for off-road equipment. It is also ideal for providing both engine and supplemental cabin heat for RV's, buses and boats. The diesel-fired Hydronic M12 puts out 41,000 btu of clean heat to keep you warm and comfortable, no matter the weather or season. While others wait for the engine to warm up, with on-board heat from Espar, you’re already en route to your destination. Available in a wide range of thermal outputs to closely match your heating needs, Espar heaters are compact, convenient and economical to operate. A Hydronic water or coolant heater offers full internal heat control, supplemental cabin heating, and domestic hot water facilities, while consuming minimal amounts of electrical power and fuel. 

Hydronic M12 Heater Benefits:

  • Produces up to 41,000 btu/hour of heat output at 11 amps
  • Automatic heat regulation through multiple heat levels
  • Low fuel and power consumption
  • Eliminates electrical plug-ins
  • Provides instant heat and defrost, eliminating cold starts
  • Easy to install and maintain
  • Self-Diagnostics
  • EPA verified/CARB compliant for use anywhere in North America


  Hydronic M12 Heater Applications:

  • Trucks
  • Vans/Campervans
  • R/V's
  • Buses
  • Boats (requires a marine heater kit)


*Note this is only the heater unit. For a new installation or replacement of an older heater, additional parts may be needed. Refer to our general hydronic heater kit list for details. Contact us at 206-548-1306 for more information.

Espar Hydronic M12 Technical Spec Sheet

Espar Marine Product Brochure


Use the guide below to help you determine what heater you need for your boat.




Technical Spec Sheet


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