Best Duct Heater Coil Kits for HVAC and Repair

Finding the right duct heater coil kit or replacement coil requires matching electrical ratings, form factor and application. The list below includes under-dash HVAC kits, a dedicated electric heater re-string kit, and versatile induction coil kits commonly used for heating or targeted induction work. Use the summary table to compare the selected products at a glance.

Product	Primary Use	Notable Feature
DH500 Heater Recoil Repair Kit (Piumeif)	Duct/Electric Heater Element Re-string	Rated 5000W 240V, link coil 1/4″ OD
Universal A/C Under Dash Kit (Universal Evaporator)	Under-dash auto HVAC—heat & cool	Complete evaporator, blower, louvers, flex duct
Kit Universal A/C Under Dash 404-000 DBSL	Under-dash auto HVAC—heat & cool	12,700 BTU capacity, 10′ flex duct included
10Pcs Induction Heater Preformed Coil Kit (Solary)	Induction heating accessories / targeted heating	Heat-stable thermoplastic housing, flexible coils
Induction Heater Coil Kit 8PCS (ajee)	Induction heating accessories / bolt removal	Eight common diameters, abrasion-resistant insulation

DH500 Heater Recoil Repair Kit

Check Price on Amazon

This product is an electric heat re-string kit intended for duct heaters, furnaces or auxiliary heat pump inserts. It specifies electrical ratings and physical coil dimensions important for heater element replacement.

• Electrical Rating: 5000 Watts at 240 V, 3750 Watts at 208 V — useful when matching circuit capacity and element duty.
• Link Coil Size: 1/4″ OD with a minimum stretch length of 40″ and maximum of 125″, allowing for various installation lengths.
• Application Focus: Designed for direct element replacement or rewinding of heater strips in duct or furnace units where a re-string is required.

When selecting a re-string kit, ensure the wattage and voltage rating align with the heater control and breaker protection. Confirm the link coil OD and stretch length fit the heater housing and terminal connections before purchase.

Universal Air Conditioning Kit For Cars

Check Price on Amazon

This under-dash universal A/C and heat kit is built for automotive conversion or replacement projects in classic cars and hot rods. It includes evaporator, condenser and related ducting components intended for vehicle HVAC installations.

• Evaporator Model: E-404-000 DBSL H/C, 32-pass all-aluminum coil, 4-way louvers.
• Capacity & Flow: 12,700 BTU capacity and 359 CFM blower performance.
• Included Components: 10′ flex duct (2½” diameter), louvers, mounting bracket, drain hose, expansion valve, thermostat and 3-speed blower switch.

For automotive duct heater needs, this kit supplies an integrated evaporator plus ducting. Verify vehicle fitment, compressor compatibility and available mounting space before installation in an older vehicle or custom application.

Kit Universal A/C Under Dash 404-000 DBSL

Check Price on Amazon

This entry is a closely related or variant listing of the universal under-dash HVAC kit. It emphasizes the same evaporator model and accessories for heat and cooling installations in vehicles.

• Dimensions: L15¾” x D12½” x H6″, intended for under-dash mounting in cabins with limited depth.
• Components: Same set of evaporator, louvers, blower, flex duct and mounting hardware provided for retrofit projects.
• Condenser Detail: Parallel flow micro-tube condenser included as part of the package for a complete system installation.

This product is relevant for users seeking a self-contained under-dash solution that includes both evaporator and ducting. Confirm the kit’s physical dimensions and HVAC line fittings are compatible with your vehicle’s plumbing and compressor selection.

10Pcs Induction Heater Preformed Coil Kit

Check Price on Amazon

Although this is an induction heater accessory rather than a duct heater coil, these preformed coils are widely used by technicians for localized heating tasks such as freeing seized fasteners or applying heat in confined spaces near ductwork or components.

• Durability: Reinforced heat-stabilized thermoplastic housing for increased lifespan.
• Flexibility: Coils are flexible and can be bent to reach awkward or restricted positions.
• Safety: Insulated and abrasion-resistant coating to protect users and components; damaged insulation requires replacement.

Induction coils are suitable when targeted, non-contact heating is required near ducts, flanges, or metal fasteners without applying direct flame. Confirm compatibility with your induction heater’s coil mounting and power characteristics when using these accessories.

Induction Heater Coil Kit 8PCS

Check Price on Amazon

This 8-piece set focuses on a range of preformed diameters for common induction heating tasks. It’s useful for maintenance teams addressing localized heating of bolts, fittings, or small ductwork components.

• Kit Composition: Multiple diameters included (20mm, 30mm, 40mm, 50mm and a free-form coil), covering typical fastener sizes.
• Lifespan: Coils designed to resist overheating and rated for repeated use.
• Insulation: Outer coating for abrasion resistance; damaged insulation requires replacement for safety.

These coils offer versatility when an induction heater is part of the maintenance toolkit. They are not direct replacements for HVAC main heater elements but can assist with repairs where targeted heat is needed without disassembling larger components.

Buying Guide: Choosing The Right Coil Kit For Duct Heaters

Selecting the correct coil kit involves electrical, mechanical and application-specific considerations. Below are key factors to compare before buying.

1. Identify The Application

Confirm whether you need a main duct heater element/re-string (used in electric duct heaters, furnaces or heat pump auxiliary heaters) or an accessory coil (induction coils for targeted heating or under-dash HVAC kits for vehicle installations). The product type dictates required specifications.

2. Electrical Ratings And Compatibility

• Voltage And Wattage: Match the kit rating to your system: common ratings include 240 V and 208 V with wattages listed. Ensure breaker and control compatibility.
• Element Type: Verify whether the kit uses link coil, strip element or induction coil technology and whether your control hardware supports it.

3. Physical Dimensions And Mounting

• Coil OD And Length: For re-string kits, check link coil OD and available stretch length to ensure proper fit inside the heater housing.
• Evaporator/Under-Dash Size: For vehicle kits, confirm evaporator dimensions and duct routing clearance for under-dash mounting.

4. Insulation, Durability And Safety

Look for heat-stabilized housings, abrasion-resistant coatings and reinforced insulation. Damaged insulation can pose electrical risks; choose kits with robust protective layers and clear replacement recommendations.

5. Intended Environment And Duty Cycle

Consider whether the coil will see continuous duty (e.g., main duct heater) or intermittent/heavy-duty cycles (e.g., induction for bolt removal). Continuous applications require components rated for prolonged heating and proper thermal management.

6. Included Components And System Completeness

• Complete HVAC Kits: Under-dash systems may include evaporator, blower, ducting and controls — choose a complete kit if you need a turnkey solution.
• Accessory Kits: Induction coil kits are accessory packs; ensure you have a compatible induction heater before purchasing.

7. Safety, Standards And Installation

Verify that electrical connections are installed by qualified personnel. Confirm grounding, overcurrent protection, and adherence to local electrical and HVAC codes when replacing heater elements or installing complete HVAC kits.

8. Comparison Perspectives

• Performance vs. Fit: A kit rated at the right wattage but physically incompatible will fail; prioritize both electrical and dimensional matches.
• Durability vs. Cost: Reinforced housings and upgraded coatings can extend service life, particularly in continuous-duty heater elements.
• Turnkey vs. Modular: Complete under-dash HVAC kits reduce sourcing complexity, while modular coil kits allow targeted repairs.

When choosing a duct heater coil kit, compile the heater model, voltage, required wattage, and physical space constraints. Cross-reference these with product specifications, insulation quality and included hardware to ensure a safe and functional installation.