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Hydronic 24/30/35 - {82,000 - 120,000 BTU/hr}

Espar's Hydronic 24 / 30 / 35 model Coolant Heater are typically used for the Large Coaches, Boats and Off-Road Engines. These heaters provide engine, fuel and hydraulic preheat and can be incorporated into a coach's heating system to provide supplemental heat. The first choice for those who require rapid heating when operating in "Arctic-like" climates. These heaters are available only in the 24v version only.
Features and Benefits include:
  • No electrical plug-ins
  • Easy start up of equipment
  • Self-Diagnostics
  • Supplemental cabin heat


  • Heat Output
    BTU/hr(KW)
    Fuel Consumption
    Gal/hr (L/hr)
    Electrical Consumption
    12V model shown
    Hydronic 24 - 82,000

    Hydronic 30 - 102,000

    Hydronic 35 - 120,000
    Diesel 1, 2 or Kerosene

    Hydronic 24 - 0.61 (2.35)

    Hydronic 30 - 0.76 (2.95)

    Hydronic 35 - 0.88 (3.4)
    Hydronic 24 - 3.3 amps

    Hydronic 30 - 3.95 amps

    Hydronic 35 - 5.0 amps
    Water Throughput Weight Dimensions
    1320 US gal/hr (5000L/hr) 40 lbs. (18 kg) L= 60 cm (24")
    W= 23 cm (9")
    H= 22 cm (8.8")

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