This means that you'll be able to search for NAICS codes directly (if that's your jam). We'll do the math; let's make better data on public procurement together.
Oil Burners; Stokers; Gas Burners.
Possible NAICS Codes
238220 – Plumbing, Heating, and Air-Conditioning Contractors
333414 – Heating Equipment (except Warm Air Furnaces) Manufacturing
454310 – Fuel Dealers
333415 – Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing
339991 – Gasket, Packing, and Sealing Device Manufacturing
444130 – Hardware Stores
562213 – Solid Waste Combustors and Incinerators
423720 – Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers
332410 – Power Boiler and Heat Exchanger Manufacturing
561720 – Janitorial Services