Sunday, May 19, 2024

Glenwood 7040 Residential Wood/Coal/Oil Boiler

Glenwood 7040 Residential Wood/Coal/Oil Boiler

The Wood only model and the Biomass Attachment cannot be sold at this time for residential applications. Once the unit has been NSPS tested and approved, sales will resume. For more information on 2016 NSPS EPA regulations, click here.

The Glenwood 7040 Multi Fuel Boiler is unique in several ways. Few boilers offer the flexibility to burn so many types of Biomass Fuels, waste oils, or fuel oil. Built to commercial industrial standards from ¼” Boiler Plate Steel each corner is beveled and double welded. All Glenwood’s are pressurized and do not require water storage. They burn much the way a modern EPA woodstove burns, clean and efficiently. Instead of defying physics to achieve a clean burn relying on computers, sensors and blowers, pushing the combustion process downward into a separate combustion chamber, which is prone to eventual failures, Glenwood’s burns naturally and efficiently with one of the best warranties in the industry, 20 yrs! With models from 100,000 to 1,000,000 BTU’s, Glenwood has you covered. Obadiah’s is the exclusive distributor of this product and dealerships are available. Contact us for more details.

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For over 30 years, Glenwood Heating has been building Commercial and Agricultural Boilers that are capable of filling a wide variety of roles in the Anabaptist heartland in Lancaster, PA. The Glenwood Boilers are built to industrial standards and severe duty to stand up to the rigors of hard use, day in and day out. Glenwood’s have a reputation for being tough well-built boilers and carry a 20 year warranty to back it up. Designed and engineered to burn just about any dry organic biomass material, a Glenwood Biomass Boiler will burn Cord Wood, Wood Chips, Wood Shavings, Wood Pellets, Pressed Wood Cubes, Processed Wood Blocks, Waste Wood Blocks, Pressed Logs, Rolled Up Newspapers, Cardboard Blocks, Saw Dust, Corn, Corn Cobs, Fodder, All Kinds of Coal, Coal Pellets, Coal Wood Pellets, Coal Biomass Pellets, Switch Grass Pellets, Dried Horse Manure, Dried Cow Pies, Trash, Waste Oil, Cooking Oil, Heavy Oil, #1, #2, #3, Fuel Oils.

The Glenwood 7040 Multi Fuel Boilers are unique in that they are truly the most versatile boiler on the market, priced to also be the best value in clean burning efficient biomass and waste burning boilers. If your looking for a solution to your heating or waste disposal needs, Obadiah's and Glenwood will help you find it through our custom engineering abilities.


Click here for Single Line PEX Pipe

Click here for Dual Line PEX Pipe


The Glenwood 7040 Multi Fuel Boiler

Burns Heats
Wood Homes
Coal Shops
Oil Warehouses
Cooking Oil Greenhouses
Waste Oil Livestock Confinement Buildings
Ear corn, Cobs and Fodder Make-up Air
Wood chips and Shavings Kilns
Pellets and More!! and More!!




  • Pressure Release Valve
  • Temperature/Pressure Gauge
  • High Limit Safety Control
  • Electronic Draft and Burner Controls
  • Individually Adjustable Legs
  • Smoke Bypass Keeps Smoke Out of the Building While Tending Fire
  • Inspection Opening Allows Monitoring of the Fire Without Opening Any Doors
  • Thermostatically Controlled Draft Blower Aids In Complete Combustion
  • Automatic Draft Box Controls Combustion Air
  • Water-Lined Firebox provides Maximum Heat Transfer
  • Insulated Heat Exchanger Access Door For Easy Servicing
  • Fin-Type Secondary Heat Exchanger For Highly Efficient Heat Transfer
  • Large Insulated Firebox Door




  • Insulation Panels to Minimize Heat Loss* (Removable Access Panel)
  • Domestic Coil For An Endless Supply of Hot Water
  • Shaking Grate, With External Shaker Lever, To Burn the Fuel of Choice
  • Ash Pan for Convenient Ash Removal**
  • Highly Efficient Beckett Oil Burner
  • Water-Lined Combustion Chamber Providing Rapid Heat Exchange and Isolate the Oil Burner From the Contaminates Emitted By the Wood Fire*
  • AT800 Biomass Attachment to expand your fuel options *NOT AVAILABLE*


* - Standard With Oil Back-Up
** - With Optional Grate


Glenwood AT800 Biomass Attachment (Currently NOT AVAILABLE)

The AT-800 Glenwood attachment's durable components as well as low speed operation are designed to provide many years of trouble free service. Adding the Biomass Attachment to your Glenwood Boiler will allow you the versatility that no other boiler offers. Burn just about anything that will fit through the feeder and is dry enough to burn; from Wood scraps to pallets, cardboard to other waste products that would otherwise cost you a trip to the dump! The possibilities are endless!


Close up, Glenwood Biomass Attachment.



Close up, Electrical Control Box for the Biomass Attachment


Side view, Glenwood Boiler with Biomass Attachment and Electrical Control Box.


  • The Glenwood Boilers offers the best boilers with the best warranty in the industry, hands down. Some manufactures offer a "Limited Lifetime Warranty" but when you read them you will find they are really "Pro Rated Warranty" some are barely worth the paper they are written on. Only Glenwood offers a NON PRO RATED 20 YEAR WARRANTY !  The closest you will find is a "5 year Bumper to Bumper with a 25 year Pro Rated Warranty" from Econoburn. Here is the Glenwood warranty for you to see for yourself, one simple page against rust through or failed welds.


Specifications Glenwood 7040 Coal/Oil Boiler
Coal Dimensions 55”L X 32”W X 51.5”H
With Oil Back-up Dimensions 76”L X 36.5”W X 52.5”H
Fire Box Dimensions 32”L X 24”W X 20”H
Door Size 18.5” X 16”
BTU Output Wood *not approved use of fuel* 165,000
BTU Output Coal 190,000
BTU Output Oil 235,000
Will Heat* (sq. ft,) 3,500
Supply and return Line Size 1.5”
Flue Size 8”
Water Capacity (Gal.) 108
Coal Approximate Weight (lbs) 1850
With Oil Back-up Approximate Weight (lbs) 2000
BTU Values
Fuel BTU's Unit of Measurement
Wood Shavings/Sawdust



Cubic Yard


Wood Chips 12,000,000 Ton
Wood Pellets 16,000,000 Ton
Coal 26,000,000 Ton
Rubber 32,000,000 Ton
Liquid Propane 92,000 Gallon
Heating Oil 139,000 Gallon
Waste Oil 190,000 Gallon
Diesel Exhaust 1800 Horsepower

Glenwood Biomass Wood Boiler

Glenwood Biomass Boiler Cutaway

Glenwood 7070 Biomass Boiler - front
Glenwood Biomass Boiler Controller
Glenwood Biomass Boiler Controller
Draft blower
Glenwood Biomass Boiler Draft Blower
Glenwood Biomass Boiler Firebox
Glenwood Biomass Boiler Firebox
Perferated Burner Tray
Glenwood Biomass Boiler Perferated Burner Tray
With AT-900 Biomass attachment installed
Glenwood AT-900 Biomass Attachment

Glenwood Biomass Boiler Installation
Plumbing hookups
Glenwood Biomass Boiler Plumbing Hookups

Glenwood Biomass Boiler Installation

Glenwood Biomass Boiler Plumbing Hookups
Glenwood Biomass Boiler Firebox
Glenwood Biomass Boiler Firebox
Glenwood Biomass Boiler Firebox
Firebox with refractory brick - (Does not come with Ash Pan or Grate)
Glenwood Biomass Boiler Firebox - (Does not come with Ash Pan or Grate)
Front of unit
Glenwood Biomass Boiler - Front
Side of unit
Glenwood Biomass Boiler - Side
Back of unit
Glenwood Biomass Wood Boiler - back
With Biomass attachment
Glenwood Biomass Boiler attachment

Glenwood AT-800 Biomass Attachment - cutaway

Glenwood AT-800 Biomass Attachment - information
Hog fuel difference
Glenwood Biomass Boiler - hog fuel difference
Perforated burn tray and auger
Glenwood Biomass Boiler - perforated burn tray and auger
Rear plumbing hook up and rear heat exchanger clean out access
Glenwood Biomass Boiler - Rear Plumbing Hook Up And Rear Heat Exchaner Clean Out Access
Secondary air inlets
Glenwood Biomass Boiler - Secondary air inlets

Glenwood 7040 Residential Wood/Coal/Oil Boiler

Glenwood 7040 Residential Wood/Coal/Oil Boiler

Glenwood 7040 Residential Wood/Coal/Oil Boiler

Glenwood 7040 Residential Wood/Coal/Oil Boiler

Glenwood 7040 Residential Wood/Coal/Oil Boiler

Glenwood 7040 Residential Wood/Coal/Oil Boiler

Glenwood 7040 Residential Wood/Coal/Oil Boiler

Glenwood Multi-Fuel Biomass Boiler - History & Features of The Glenwood Boiler

Glenwood 7080 Multi-Fuel Biomass Boiler - System Overview

Glenwood 7080 Multi-Fuel Biomass Boiler - Construction & Warranty

Glenwood 7070 Multi-Fuel Biomass Boiler - Review and Firebox in Action

Glenwood 7070 Multi-Fuel Biomass Boiler - System Controls

Glenwood 7080 Multi-Fuel Biomass Boiler - Biomass Attachment and System Controls

Top Five Reasons We Choose Glenwood Boilers

Glenwood Boilers - Frequently Asked Questions

Glenwood Boilers - Wood & Gas Combo Boiler, and Auto Ignition


Heat Area (sq.ft.)
Fireplace Specific Options





Cooktop Material

Water Heating Options

Flue Orientation


Venting (Gas Stoves)


Viewing Area

Interior Style