Gas Stove Nozzle Flow Ratings Explained: Aperture, BTU & Gas Type

Ask any experienced installer what trips them up most on a conversion or repair job, and nozzle sizing will top the list. The aperture engraved on a nozzle is not just a number — it is the key that controls heat output, fuel efficiency, and safety. For parts distributors, being able to explain nozzle flow ratings turns a commodity sale into a trusted consult.

What the Aperture Actually Controls

The nozzle aperture is the calibrated orifice through which gas is delivered to the burner. A smaller aperture meters less gas; a larger aperture meters more. Because heat output rises with gas flow, the aperture size directly determines how hot a burner can run. Get the size wrong and you get a weak flame or a dangerously over-fueled one.

Aperture vs Gas Type

This is the distinction that drives most replacement sales. LPG (propane/butane) is delivered at higher pressure, so it needs a smaller aperture to meter the same energy. Natural gas is delivered at lower pressure and needs a larger aperture. Converting a stove between the two means swapping the nozzles — a job that repeats across entire neighborhoods when a utility rolls out mains gas.

Reading the Flow Range

• Small apertures (0.45–0.75mm) — LPG burners and low-output inner rings.
• Mid apertures (0.80–1.00mm) — standard natural gas and mid-size burners.
• Large apertures (1.05–1.35mm) — high-output burners and large outer rings.

Stock the Full Range, One Thread

THREEMI manufactures nozzles in 16 aperture sizes from 0.45mm to 1.35mm, all on a unified M6x0.75 thread. That means one thread standard covers the entire range, so installers carry a compact kit and distributors order a single SKU family. Factory-direct pricing and carton MOQ make it easy to stock the complete flow range for your market.

About THREEMI

THREEMI is the export brand of Shenzhen Sanmi Manufacturing Co., Ltd., a professional gas stove and kitchen appliance factory in Guangdong, China. With 400+ employees, a 20,000㎡ production facility, and an annual output of 3 million units, we serve wholesalers, distributors, brand owners, and e-commerce sellers in over 30 countries. Our factory is certified ISO9001, CCC, CE, UL, GS, ETL, NF, and SASO.

Welcome Wholesale Gas Stove Parts Orders

We supply the complete gas stove parts range — SABAF-compatible burner caps, nozzles (0.45mm–1.35mm), flame spreaders, burner sets, ignition parts, thermocouples, and valve bodies — factory-direct at wholesale prices with flexible carton MOQ.

WhatsApp: +86 186 7003 0673
Email: logan@threemi.com
Website: www.threemi.com