Hot Water Coils
Heating hot water coils are an integral part of any HVAC system that relies on boilers to provide comfort heating, booster heating, and more. Coils are designated as hot water when they are one or two rows deep. Because this technique has been used for decades in the commercial space, it is not uncommon for our customers to request replacement parts for air handling units that are no longer in production. Also known as hydronic heating coils, hot water coils circulate heated water through a coil of copper tubing and aluminum fins, transferring heat into the airstream as it passes through an air handler or duct system — providing an efficient, precisely controllable alternative to electric resistance or steam heat.
Coil Replacement Company has 100+ years of engineering drawings and proprietary performance heat transfer information, with a myriad of OEM manufacturers’ coils, products and air house systems. CRC has mastered direct OEM replacement coils for manufacturers including, but not limited to, Aerofin, American Standard, Bohn, Carrier, Daikin, Lennox, Marlo, McQuay, Modine/Heatcraft, Nesbitt, Temtrol, Trane, Westinghouse, and York.
Tailor-Made to Meet Performance
For HVAC systems to function properly, it is of critical importance to have a hot water coil that is tailor-made to meet the performance of the air handling unit it serves.
Utilizing the most advanced, technologically efficient engineering software, the performance your system requires is met by modifying coil size, circuitry, and materials of construction. Turbo-Spirals are also available to increase efficiency and ensure maximum heat transfer. CRC builds hot water coils in a range of sizes and row depths (typically 1–2 rows for standard hot water applications, with deeper multi-row configurations available for higher-capacity or hydronic reheat needs), with copper tube and aluminum fin construction as standard and casing options including fully flanged and side/end plates only.
CRC assigns a dedicated engineer to review, visit, measure, or consult (virtually) by analyzing your exact requirements. CRC then generates drawings, performance evaluations, and quotations – while taking responsibility for your coil and/or product solution. We deliver unparalleled service, allowing the mechanical contractor and end-customer to focus on their core assets and property management responsibilities.
Long-Lasting Performance That Increases Coil Lifespan
To ensure long-lasting performance while increasing the lifespan of your hot water coils, CRC offers many different coating options that provide an additional level of protection against corrosive environments including, but not limited to, automotive paint houses, chlorinated pool facilities, coastal sea areas, industrial manufacturing plants, locations with high sun exposure, medical/pharmaceutical environments, and restaurant kitchens. Contact us for assistance in selecting from our available coatings, including ElectroFin® E-coat, Endura® Coatings (750+ Technologies), Infinigard, phenolic, and UV Topcoat.
Hot Water Coils Across Industries
CRC's hot water and hydronic heating coils support comfort and process heating needs across the full range of industries we serve:
- Commercial Properties & Mechanical Contractors — reliable comfort heating for tenants and building occupants year-round.
- Education, Government & Municipality — classroom, dormitory, and public-facility heating with OEM-match replacement parts.
- Manufacturing & Equipment and Food & Beverage — consistent process heat where temperature swings can affect production quality.
- Medical & Pharmaceutical — dependable heating for cleanrooms and patient-care environments.
- Automotive — humidity and temperature control critical to paint and manufacturing processes.
- Electrical, Gas & Nuclear Energy — facility heating solutions for energy production environments.
Frequently Asked Questions About Hot Water Coils
A hot water coil is an HVAC heat exchanger that circulates heated water through copper tubing and aluminum fins to warm air passing through an air handler or duct system. Typically built 1–2 rows deep, hot water coils provide efficient, precisely controllable comfort heating for commercial and industrial buildings.
"Hot water coil" and "hydronic heating coil" describe the same type of equipment — a coil that uses circulated heated water (rather than steam or electricity) to warm air. "Hydronic" simply refers to any system using liquid as the heat-transfer medium, making the terms functionally interchangeable in HVAC.
Common signs include reduced heating output, water leaks, uneven airflow temperature, or visible corrosion on tubes and fins. Since coils vary by air handler make and model, it's best to have a coil engineer measure and evaluate performance before ordering a replacement.
Yes. Direct OEM-match replacement coils can be engineered even for discontinued air handling units, using historical engineering drawings and performance data. CRC maintains 100+ years of combined OEM specifications for manufacturers like Trane, Carrier, York, and Daikin to rebuild coils no longer in production.
Protective coatings such as ElectroFin® E-Coat, Endura®, Infinigard, phenolic, Insitu®, and UV coatings extend coil lifespan in corrosive environments like coastal air, chlorinated pool facilities, and industrial or medical settings. The right coating depends on the specific environmental exposure the coil will face.
Why not give CRC a call now … and let’s work together to find the customized solution that is right for you!