Hardy Wood Furnace Parts

If you are looking for Hardy wood furnace parts, you are probably not browsing for fun. Something quit working, your furnace is not heating like it should, or you are trying to replace a worn part before it fails in the middle of winter. This page is built to help you do exactly that. Here you will find the most common Hardy furnace replacement parts, practical troubleshooting help, and answers to the questions Hardy owners ask most often. Whether you need a new grate, circulator pump, thermostat, or water solenoid, we can help you get pointed in the right direction.

If you are not sure which Hardy part fits your furnace, use our Parts Request Form.

Shop Common Hardy Replacement Parts

These are some of the Hardy furnace parts homeowners replace most often when performance starts to slip.

• Hardy Cast Iron Grate (3105.00)
• Hardy Cast Iron Grate (3105.20)
• Hardy Electric Water Solenoid Assembly (1100.00)
• Hardy Honeywell Hi-Temp Thermostat (2000.08)
• Hardy Cast Iron Pump - Taco 009 (501.06)
• Hardy H25 Stainless Steel Pump (502.08)

Most Common Hardy Furnace Problems

Hardy outdoor wood furnaces are known for being simple, durable heaters, but there are a few parts and maintenance issues that come up again and again. In real-world use, the most common Hardy furnace problems usually involve:

• Warped or clogged grates
• Water solenoid issues
• Circulator pump failure or poor water flow
• Thermostat or temperature control problems
• Bad door seals
• Ash buildup and poor combustion airflow
• Creosote buildup in the stack or baffle area

Below is a practical breakdown of what to watch for and which Hardy parts are most often involved.

Hardy Grates: One of the Most Common Wear Parts

If your Hardy furnace is burning poorly, using more wood than usual, or struggling to maintain temperature, the grate system is one of the first things to inspect. Grates take direct heat, ash, and weight every day, so they are a normal wear item on many Hardy units.

Signs your Hardy grates may need attention

• Fire does not burn evenly
• Wood usage is higher than normal
• Ash is packed tightly around the grate area
• Grates appear warped, sagging, or cracked
• Airflow under the fire seems restricted

For many Hardy models, grate wear is closely tied to ash buildup. If ash is allowed to build too high, it blocks airflow and creates extra heat stress on the grates. In some cases, a slightly warped grate can be flipped and reused for a while. If it is cracked or badly distorted, replacement is the better fix.

Common Hardy grate parts

• 3105.00 – Cast iron grate used on H2, H3, H6, LC300, and some H4/H5 setups
• 3105.20 – Cast iron grate used on H25, LC500, LC2500, and some H4/H5 setups

If you own an H25, the 3105.20 grate is one of the most important part numbers to know.

Hardy Water Solenoid Problems

If your Hardy furnace is having trouble maintaining water level, or the low water warning system is acting up, the water solenoid assembly deserves a close look. This part is part of the automatic fill system on many Hardy furnaces.

Symptoms of a bad Hardy water solenoid

• Low water warning light stays on
• Automatic fill does not seem to work
• Water level problems keep coming back
• You suspect the fill valve is not opening correctly

Common Hardy water fill parts

• 1100.00 – Electric water solenoid assembly
• 1100.05 – Electric water solenoid valve only
• 1100.10 – Electric water solenoid coil only
• 1100.45 – Electric water solenoid filter element only

If you want the simplest replacement path, many homeowners start with the complete 1100.00 water solenoid assembly.

Hardy Pump Problems and Poor Water Circulation

If the water in your Hardy furnace is hot but your house is not heating properly, the circulator pump is one of the most likely culprits. Pump problems can show up as a total no-heat condition, weak heat delivery, or inconsistent performance.

Signs of a failing Hardy pump

• Furnace water is hot but heat is weak indoors
• Little or no water movement through the system
• Pump is noisy or not running
• House blower runs but air is not hot enough

Common Hardy pump parts

• 501.06 – Taco 009 cast iron pump with power cord and gaskets
• 502.08 – Taco 009 stainless steel pump with power cord and gaskets

The right pump depends on your furnace model and plumbing setup. For H25 systems, the 502.08 stainless steel pump is a common part to verify.

Hardy Thermostat and Temperature Control Parts

When a Hardy furnace does not respond correctly to water temperature, will not open the damper properly, or seems inconsistent in operation, the thermostat and control system should be checked. Temperature control issues can affect burn quality, heat output, and overall system reliability.

Common signs of thermostat or control trouble

• Water temperature stays too low
• Damper does not open when it should
• Draft blower does not come on
• Heat output feels inconsistent

Common Hardy thermostat and control parts

• 2000.08 – Honeywell hi-temp thermostat
• 2000.16 – H25 aquastat / hi-temp with well style control reference
• 2000.36 – Low temp sensor
• 2000.52 – Relay

If you are looking for a common Hardy replacement thermostat, 2000.08 is one of the main part numbers homeowners search for.

Other Hardy Parts That Matter More Than People Think

Not every Hardy repair starts with a major component. Sometimes the real problem is simpler.

Door seals

If your furnace is burning too much wood, the door seals may be leaking extra air into the firebox. That can throw off combustion and increase fuel consumption.

• 3000.21 – 80" of 3/4" rope liner for H25 firebox door
• 3000.25 – 54" of 5/8" rope liner for H25 ash door

Damper and blower parts

If the furnace is not getting enough combustion air, check these parts:

• 2001.05 – Damper solenoid
• 2002.30 – 130 CFM blower

Baffle and airflow components

Blocked airflow can cause weak burn performance even when the main parts are technically still working.

• 3200.27 – Flame baffle for H25

Hardy Parts List: Common Repair Parts by Part Number

Here is a quick reference list of common Hardy furnace replacement parts:

• 3105.00 – Hardy cast iron grate
• 3105.20 – Hardy cast iron grate
• 1100.00 – Hardy electric water solenoid assembly
• 2000.08 – Hardy Honeywell hi-temp thermostat
• 501.06 – Hardy Taco 009 cast iron pump
• 502.08 – Hardy Taco 009 stainless steel pump
• 1100.28 – Low water switch
• 1100.30 – Low water indicator light
• 2000.36 – Low temp sensor
• 2000.52 – Relay
• 2001.05 – Damper solenoid
• 2002.30 – 130 CFM blower
• 3000.21 – H25 firebox door rope liner
• 3000.25 – H25 ash door rope liner
• 3200.27 – H25 flame baffle

Need Help Finding the Right Hardy Part?

Hardy furnaces have multiple models, and some parts vary by setup, serial number, or furnace size. If you are not completely sure which Hardy wood furnace part you need, do not guess. It is much easier to match the correct part before you order than to deal with the wrong one later.

Use our Parts Request Form here and send us your model information.

Hardy Wood Furnace Parts FAQ

What are the most common Hardy wood furnace problems?

The most common Hardy furnace problems are clogged or warped grates, circulator pump failure, thermostat or aquastat issues, water solenoid problems, bad door seals, and airflow restrictions caused by ash or creosote buildup.

How often should I replace Hardy furnace grates?

There is no fixed schedule. Hardy furnace grates should be replaced when they are cracked, badly warped, or no longer allow proper combustion support. Keeping ashes below grate level helps extend grate life.

Where can I find Hardy wood furnace replacement parts?

You can find Hardy wood furnace replacement parts at Stove Parts Unlimited, including common parts like grates, pumps, thermostats, and water solenoid assemblies.

How do I know if my Hardy water solenoid is bad?

If the automatic fill function is not working, the low water warning light stays on, or you keep having water level problems, the water solenoid assembly or one of its related components may be failing.

Can I use aftermarket parts in my Hardy furnace?

Sometimes, but compatibility matters. On key parts like pumps, thermostats, grates, and water system components, it is usually best to use the correct Hardy replacement part or a properly matched equivalent.

Why is my Hardy furnace using more wood than normal?

Excessive wood use is often caused by bad door seals, a damper lid not closing properly, restricted airflow, or ash buildup affecting combustion.

Looking for Hardy wood furnace parts now? Start with the common replacement parts above, or use our Parts Request Form if you need help identifying the correct part.