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The Hyprotherm, Front Loading, Residential Hydronic series is a front loading furnace with more water capacity and a larger firebox then any other furnace in its class. These coal only furnaces feature fireboxes that are 3/8” thick. The water jacket bottom is also 3/8” thick with the sides and top being 3/16”. All of these front loading furnaces come with large 24” x 24” fuel fill doors and removable ash pans to make ash removal simple. They have cast iron coal grates and each furnace is pre wired with only one connection to a power supply necessary, making them basically plug and play. Each comes with; lock down vault assembly door latch, two 1” supply and two 1” return nipples. Also includes a water level sight gauge and a digital thermostat to control the combustion blower.


  • Water Capacity; 403 gallon
  • Water Jacket Thickness Bottom; 3/8”
  • Water Jacket Thickness Sides and Top; 3/16”
  • Firebox Capacity; 41 cubic feet
  • Firebox Dimensions; 3/8” thick @ 69.5”L x 30”W x 34”H
  • Overall Dimensions: 122.5”L x 48”W x 87”H
  • Crated Dimensions: 130″L x 51″W x 95″H
  • Shipping Weight: 3763 lbs
  • Fuel Door; 24” x 24”
  • Grate System; Shaker Grate From Flat Cast
  • Ash Cleanout: Removable Ash Pan
  • BTUs; 451,562 @ 180 degree
  • Heatable Area; 11,288 sq ft Approx

The standard insulation on our furnaces is:

2″ of Morgan Super Wool with an R value of 56.8 on the tops and fronts and 3″ of Knauf ET Blanket + 1/4″ of Solar Guard for a combined R value of 23.1 on the rest of the furnace

The cold weather package is R-88.23 on tops and fronts and 68.4 on the rest of the furnace and is available for an additional $307.00

You can find out more insulation information including video demonstrations by going to the insulation page.

Hydronic Installation Manual