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    423720 - Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers

    If you're involved in the wholesale trade of plumbing and heating equipment, NAICS code 423720 is crucial for classifying your business. This industry code covers a wide range of merchant wholesalers specializing in plumbing and hydronic heating products. Whether you're a contractor, commercial user, or another wholesaler, understanding NAICS 423720 helps streamline operations, secure government contracts, and analyze market opportunities effectively.

    What is NAICS Code 423720?

    NAICS Code 423720 refers to Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers. This industry comprises establishments primarily engaged in the merchant wholesale distribution of plumbing and heating equipment and supplies, including hydronics. These businesses sell products such as pipes, fittings, boilers, heating systems, and more to contractors, commercial users, and other wholesalers.

    Sector and Typical Business Activities

    This NAICS code resides within the Wholesale Trade sector, specifically focusing on:

    • Wholesale distributors of plumbing fixtures and supplies
    • Wholesalers of heating equipment and hydronic systems
    • Suppliers of pipes, valves, and related plumbing components

    Companies operating under this classification play an essential role in the supply chain, ensuring contractors and commercial clients receive the plumbing and heating materials necessary to complete their projects.

    Size Standards for NAICS Code 423720

    To determine eligibility for certain federal programs and contracts, the Small Business Administration (SBA) defines size standards. For NAICS 423720, the size standard is typically based on the number of employees, which is:

    • Maximum of 200 employees

    This means businesses with 200 or fewer employees generally qualify as small businesses under this NAICS code.

    Examples of Businesses Under NAICS 423720

    Businesses classified under this NAICS code often include:

    • Wholesale distributors specializing in plumbing fixtures and related supplies
    • Wholesalers providing heating systems including boilers and hydronic heating equipment
    • Suppliers of essential components like pipes, valves, and fittings used in plumbing and heating installations

    Detailed Code Description Table

    Code Detail Description
    Bathtubs merchant wholesalers Dealers specializing in bathtubs
    Boilers merchant wholesalers Wholesale of heating, hot water, power, or steam boilers
    Brass goods, plumbers' merchant wholesalers Suppliers of plumbers’ brass components
    Burners, fuel oil and distillate oil, merchant wholesalers Distributors of oil burners
    Convectors merchant wholesalers Dealers of heating convectors
    Drinking fountains (except refrigerated) wholesalers Suppliers of non-refrigerated drinking fountains
    Fireplaces, gas merchant wholesalers Dealers of gas fireplaces
    Fireplaces, prefabricated gas wholesalers Suppliers of prefabricated gas fireplaces
    Fittings and valves, plumbers' wholesalers Plumbing fittings and valves distributors
    Furnaces (except forced air), heating wholesalers Suppliers of non-forced air heating furnaces
    Gas fireplaces merchant wholesalers Dealers specializing in gas fireplaces
    Gas hot water heaters wholesalers Distributors of gas hot water heaters
    Heating boilers, steam and hot water wholesalers Wholesale of steam and hot water heating boilers
    Heating equipment, hot water wholesalers Suppliers of hot water heating equipment
    Hydronic heating equipment and supplies wholesalers Distributors specializing in hydronic heating
    Lavatory fixtures wholesalers Suppliers of lavatory fixtures
    Oil burners, heating wholesalers Dealers of heating oil burners
    Pipe and boiler coverings wholesalers Suppliers of pipe and boiler insulation
    Pipe fittings and valves, plumbers' wholesalers Dealers of pipe fittings and valves
    Plumbers' brass goods wholesalers Suppliers of brass plumbing goods
    Plumbing and heating valves wholesalers Distributors of various plumbing valves
    Plumbing equipment wholesalers Suppliers of general plumbing equipment
    Plumbing fixtures wholesalers Dealers of plumbing fixtures
    Plumbing supplies wholesalers Distributors of various plumbing supplies
    Radiators, heating, nonelectric wholesalers Suppliers of non-electric heating radiators
    Sanitary ware, china or enameled iron wholesalers Dealers of sanitary ware made of china or enameled iron
    Sinks wholesalers Suppliers of sinks
    Solar heating panels and equipment wholesalers Distributors of solar heating products
    Spa equipment wholesalers Dealers in spa equipment
    Stoves (noncooking), heating wholesalers Suppliers of heating stoves
    Toilet bowls and tanks wholesalers Dealers of toilet bowls and tanks
    Urinals wholesalers Suppliers of urinals
    Valves, plumbing and heating, wholesalers Distributors of plumbing and heating valves
    Water heaters, gas and electric wholesalers Suppliers of gas and electric water heaters
    Water purification equipment, household-type wholesalers Dealers of household water purification systems
    Water softening and conditioning equipment wholesalers Suppliers of water softening/conditioning equipment

    Frequently Asked Questions (FAQ)

    What does NAICS code 423720 specifically cover?

    NAICS 423720 includes businesses primarily engaged in the wholesale distribution of plumbing and heating equipment and supplies, including hydronic heating systems.

    Which sector does NAICS 423720 belong to?

    It belongs to the Wholesale Trade sector.

    What is the SBA size standard for NAICS 423720?

    The size standard is generally a maximum of 200 employees.

    What are some examples of products covered under this code?

    Products include pipes, fittings, boilers, heating equipment, valves, plumbing fixtures, bathtubs, fireplaces, and water heaters.

    Can businesses selling solar heating panels fall under this NAICS code?

    Yes, solar heating panels and equipment wholesalers are included under NAICS 423720.

    How does this NAICS code help businesses?

    It helps in government contracting, market research, and proper business classification according to industry standards.


    In summary, NAICS code 423720 is essential for classifying businesses that wholesale plumbing and heating equipment, especially hydronics. Understanding its scope, sector, size standards, and detailed classifications can position your business for growth, compliance, and success in the competitive wholesale trade space.