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ProTech 300 Boiler Water Treatment
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: AH&S

ProTech300 is a new and improved wood boiler water treatment that goes beyond standard solutions to safeguard your boiler from rust, corrosion, and scale. By combining three powerful active ingredients—nitrite, phosphonate, and an anodic inhibitor—ProTech300 delivers unmatched performance and peace...

$44.99
High Temperature Silicone 10 Oz
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: AH&S

Product DescriptionSILA-SEAL Professional Grade Silicone Sealants are non-slumping, one-part 100% silicone rubber acetoxy sealants that cure to a tough, rubbery solid upon exposure to moisture in the air (RTV-room temperature vulcanizing) with long-term flexibility and durability. All SILA-SEAL Professional Grade...

$12.99$9.99
AmTech300 Wood Boiler Treatment Corrosion Inhibitor - 1 gallon
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: AH&S

Looking for a reliable, budget-friendly solution to protect your wood boiler? AmTech300 delivers two layers of powerful protection—nitrite and phosphonate-based chemistry—offering the same results as top-tier brand-name treatments without the premium price tag. Designed to prevent rust, corrosion, and scale,...

$34.99
Dormeyer 4X240 / Dayton 2005 M-1 Laminated Solenoid
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Dormeyer

Product Description Laminated solenoid, replacement for all WoodMaster models, pull-type continuous duty cycle rated at 25 Degree constructed of durable laminated steel with corrosion-resistant frame & Plunger. Solenoids have polyester or nylon bobbins, encapsulated or taped coils, steel Plunger springs,...

$65.99$47.95
300 Test Kit
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: AH&S

Product Description Test Nitrite levels easily and accurately just like the lab! This test kit is designed to test the Nitrite levels in your boiler fill water. It is an easy and accurate means to determine the level or amount...

$22.00$19.95
CF205 System Cleaner & Flush For Outdoor Wood Boilers
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: AH&S

Product Description CF205 System Cleaner has been specifically designed for safely cleaning outdoor & indoor wood boilers with mild steel and/or stainless steel construction. CF205 will safely remove deposits within the system that compromise boiler efficiency and promote corrosion. CF205...

$27.95
NBK 1TDP3 Blower Compatible with Dayton 1TDP3
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: NBK

Product Description Dynamically balanced, the NBK Blower, compatible with the Dayton model FN1TDP3 (4C443), mounts in any position and operates with minimal noise and vibration, to maintain CFM at higher static pressures. Motors have cast aluminum end shields for greater...

$138.99$79.99
AmTech300 2 Pack Boiler Treatment Rust Inhibitor for Outdoor Wood Boilers
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: AH&S

AmTech 300 Wood Boiler Water Treatment is an inexpensive alternative to brand-name boiler treatment chemicals at half the cost. Our AmTech 300 Boiler Treatment will: It offers 2 Levels of Protection. Protect your wood boiler from rust, corrosion, and scale...

$65.99
Yearly Maintenance Kit - Includes 9' Fire Rope, 1 gal. ProTech300 & 1 RTV Silicone, 10 oz
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Alternative Heating & Supplies

Product Description This Kit is all you need to keep your Wood Boiler running like the day you bought it!  Typical Applications Water boilers Features 1x10 oz. tube of Black RTV Silicone 1 Gallon of Protech 300 Boiler treatment that...

$72.89
Dormeyer 1000 M-1 Dayton 4X239 Laminated Solenoid
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Dormeyer

Product DescriptionLaminated solenoid, replacement for all wm models, pull-type continuous duty cycle rated at 25 Degree constructed of durable laminated steel with corrosion-resistant frame & Plunger. Solenoids have polyester or nylon bobbins, encapsulated or taped coils, steel Plunger springs, &...

$42.99
ProTech300 Outdoor Wood Boiler Water Treatment - 4 Pack
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Alternative Heating & Supplies

Product Description ProTech300 Boiler Treatment - Has been designed to be used in boiler treatment programs at a lower cost, yet exceeding all other brands on the market with having three levels of protection.  Adding 1 gallon of ProTech300 to...

$159.80
Woodmaster 4400 Maintenance Kit - Includes 8' Fire Rope, 1 Fan Cover, 1 gal. AmTech300 & 1 RTV Silicone, 10 oz
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Alternative Heating & Supplies

Maintenance Kit - 4400 Includes Fire Rope for 4400, one FC546, RTV Silicone and One Gallon Amtech 300 The WoodMaster 4400 Yearly Maintenance Kit has everything you will Need to Tune Up your WoodMaster! The Yearly Maintenance Kit Includes: Fire...

$79.89
Woodmaster 4400 Maintenance Kit - Includes 8' Fire Rope, 1 Fan Cover, 1 gal. ProTech300 & 1 RTV Silicone, 10 oz
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Alternative Heating & Supplies

Maintenance Kit - 4400 Includes Fire Rope for 4400, 1- Fan Cover FC546, 1- Tube of RTV Silicone and One Gallon Protech 300 The WoodMaster 4400 Yearly Maintenance Kit has everything you will Need to Tune Up your WoodMaster! The...

$89.89
Protech300 Yearly Maintenance Kit: 2 ProTech300 and 1 Test Kit
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Alternative Heating & Supplies

Product Description ProTech 300 Boiler Treatment - Has been designed to be used in boiler treatment programs at a lower cost, yet exceeding all other brands on the market with having three levels of protection.  Adding 1 gallon of ProTech...

$109.93
CF205 2-Pack  System Cleaner & Flush for Outdoor Wood Boilers
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Alternative Heating & Supplies

Product Description CF205 System Cleaner has been specifically designed for safely cleaning outdoor & indoor wood boilers with mild steel and/or stainless steel construction. CF205 will safely remove deposits within the system that compromise boiler efficiency and promote corrosion. CF205...

$55.90
Hardy Door Seal Kit - includes 6' of 5/8" Fire Rope & 1 RTV Silicone, 10 oz
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Alternative Heating & Supplies

Product Description This Hardy Boiler Outdoor Wood Furnace Door Seal Kit has 6 feet of 5/8 Inch Braided fiberglass fire rope and 1 Professional Grade RTV Silicone. Typical Applications For H-2, H-3, H-4 and H-5 Hardy stove models Features 5/8"...

$18.33
Snap Disc Manual Reset
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Dormeyer

Product DescriptionSnap Disc with Manual Reset, snap switch thermostats are bimetal mechanical thermostats that function via the thermal expansion and contraction of a bimetal disc that “snaps” from a convex to a concave shape at a set temperature. When the...

$39.99$31.55
Woodmaster 5500 Maintenance Kit - Includes 9' Fire Rope, 2 Fan Cover, 1 gal. ProTech300 & 1 RTV Silicone, 10 oz
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Alternative Heating & Supplies

Maintenance Kit - 5500 Includes Fire Rope for 5500, 2- Fan Covers FC546, 1- Tube of RTV Silicone and One Gallon Protech 300 The WoodMaster 5500 Yearly Maintenance Kit has everything you will Need to Tune Up your WoodMaster! The...

$110.87
Velo 150 Circulating Pump
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PRODUCT TYPE: Heating & Plumbing

MANUFACTURER: Alternative Heating & Supplies

Introducing Our Brand New Circulating Pumps: Elevate your wood boiler system to unprecedented levels of precision and performance with the Velo Series Circulation Pumps. Comes with Plug attached! 2 year warranty. High-Temperature Performance:The Velo Series is designed to thrive in...

$269.99
Protech300 Boiler Treatment and Test Kit
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Alternative Heating & Supplies

Product Description This yearly maintenance kit includes an our outdoor wood boiler treatment ProTech300 for rust, corrosion and scale prevention as well as a test kit to test nitrite levels and pH. A great way to keep your furnace running...

$64.94
Protech300 Yearly Maintenance Kit: 1 ProTech300 and 1 Test Kit
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Alternative Heating & Supplies

ProTech 300 Boiler Treatment - Has been designed to be used in boiler treatment programs at a lower cost, yet exceeding all other brands on the market with having three levels of protection. Adding 1 gallon of ProTech 300 to...

$64.94
Velo 100 Circulating Pump
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PRODUCT TYPE: Heating & Plumbing

MANUFACTURER: Alternative Heating & Supplies

Introducing Our Brand New Circulating Pumps: Elevate your wood boiler system to unprecedented levels of precision and performance with the Velo Series Circulation Pumps. Comes with Plug attached! 2 year warranty. High-Temperature Performance:The Velo Series is designed to thrive in...

$214.99
MolyArmor 350 pH Test Kit
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: WoodMaster

Product Description MolyArmor 350 PH Test Kit. Test your PH levels easily and accurately! This test kit is designed to test the PH levels in your boiler fill water. This test kit works only with MolyArmor 350 Corrosion Inhibitor This...

$28.95
Fan Cover for Draft Fan 2-Pack
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PRODUCT TYPE: Wood Furnace Parts & Accessories

MANUFACTURER: Alternative Heating & Supplies

FC546 Fan Cover is an simple device that works effectively on keeping the air out and saves wood and reduces smoke. This is a rubber fan cover that covers most Dayton Fans to stop the air flow into wood furnaces. This is...

$37.98

Hardy Wood Boilers Parts

Hardy wood boilers are built for long-term performance. But like any heating system, they require reliable replacement parts and regular maintenance to operate efficiently. At Alternative Heating & Supplies, you’ll find a wide selection of Hardy-compatible boiler parts and cleaners designed to keep your system running safely and effectively. From essential components like solenoids and blowers to water treatment solutions and maintenance kits, our inventory supports everything from routine upkeep to full system repairs.

Hardy Boiler Parts Available

From electrical components and controls to combustion components and plumbing parts, ALT Heat has a wide selection of replacement parts and accessories to keep your Hardy outdoor wood furnace running efficiently and effectively. These high-quality replacement parts are compatible with all Hardy wood boiler models and cost less than OEM parts.

Replacement Parts for Reliable Performance

Electrical Components and Controls

Wood boilers consist of a network of sensors and wiring that help tie everything together. From solenoids, which play a key role in regulating fuel and airflow, to aquastats and controllers that help monitor water temperature and activate pumps, replacing worn or outdated parts, sensors, and wiring helps improve efficiency and extend the life of your Hardy boiler.

Airflow and Combustion Components

These parts are crucial for ensuring any wood boiler has a steady supply of air to support proper combustion, which affects heat output and efficiency. From blowers and fans to draft-control parts to door seals and gaskets, these common airflow and combustion components help optimize burn quality and keep any Hardy boiler operating safely and reliably.

Circulation and Plumbing Parts

Often described as the backbone of any boiler, these parts are essential to the system's ability to distribute heat effectively. Circulation pumps keep heated water moving throughout the system and help ensure even heat delivery, while flanges and fittings provide secure, leak-free connections. Heat exchangers are one of a boiler's most important components, helping transfer energy from the boiler to the water or air that's being heated. Many Hardy boiler systems also rely on blowers, pumps, and seals as part of a universal solution to maintain proper airflow and heat transfer.


Why Choose Alternative Heating & Supplies for Hardy Parts?

Aside from a wide inventory of in-stock parts and accessories available at competitive prices, you'll receive expertise that you won't get anywhere else when you work with ALT Heat. Aside from manufacturing affordable, high-quality replacement parts, you can count on receiving high-level support and service to ensure your needs are met, whether you're a DIYer or a seasoned professional. We also offer fast shipping and free shipping on orders over $199.99. It's all part of the ALT Heat difference.

Frequently Asked Questions

What parts commonly need replacement on a Hardy wood boiler?

Common replacement parts for a Hardy wood boiler include pumps, thermostats, and water system components.

How often should Hardy boiler parts be maintained or replaced?

It's best practice to perform an inspection and tune-up on your Hardy boiler annually before the winter months, repairing warped, cracked, or failing parts as needed rather than on a fixed schedule.

Are these parts compatible with all Hardy boiler models?

Yes, ALT Heat supplies high-quality Hardy heater parts compatible with boiler models.

What happens if I can't find my part?

Contact ALT Heat and one of our associates will help you locate the right part.