- Appliances, gas (except dryers, freezers, refrigerators), merchant wholesalers [2007]
- Boilers (e.g., heating, hot water, power, steam) merchant wholesalers
- Brass goods, plumbers’, merchant wholesalers
- Burners, fuel oil and distillate oil, merchant wholesalers
- Cooking equipment, gas, household-type, merchant wholesalers [2007]
- Fireplaces, gas, merchant wholesalers
- Fittings and valves, plumbers’, merchant wholesalers
- Fountains, drinking (except refrigerated), merchant wholesalers
- Furnaces, (except forced air), heating, merchant wholesalers
- Gas fireplaces merchant wholesalers
- Gas hot water heaters merchant wholesalers
- Gas ranges merchant wholesalers [2007]
- Heating boilers, steam and hot water, merchant wholesalers
- Heating equipment, hot water, merchant wholesalers
- Hydronic heating equipment and supplies merchant wholesalers
- Oil burners, heating, merchant wholesalers
- Ovens (except electric), household-type, merchant wholesalers [2007]
- Plumbers’ brass goods merchant wholesalers
- Plumbing and heating valves merchant wholesalers
- Plumbing equipment merchant wholesalers
- Plumbing fixtures merchant wholesalers
- Plumbing supplies merchant wholesalers
- Sanitary ware, china or enameled iron, merchant wholesalers
- Solar heating panels and equipment merchant wholesalers
- Stoves (i.e., noncooking), heating, merchant wholesalers
- Stoves, cooking and heating (except electric), household-type, merchant wholesalers [2007]
- Valves, plumbing and heating, merchant wholesalers
- Water heaters (except electric) merchant wholesalers [2007]
- Water heaters, gas and electric, merchant wholesaler
- Water softening and conditioning equipment merchant wholesalers
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