How to Choose the Right Gas Jets for Your Cooker or Hob (2025 Guide)

Whether you need to replace worn natural gas jets or you are converting your cooker from NG to LPG (or LPG back to NG), choosing the correct gas jets is essential. This guide explains how jet sizes work, how to identify compatible replacements, and how to choose the right conversion kit for your appliance.

What Are Gas Jets?

Gas jets — also known as injectors or nozzles — control how much gas flows into each burner on your cooker or hob. Every jet has a number stamped on it, such as 50, 65, 70, 87, 100. This number represents the diameter of the hole in hundredths of a millimetre.

The number on the jet is the most important part: if the number matches your existing jet, the jet is compatible to replace your worn injector.

Natural Gas Jets vs LPG Jets

Natural gas (NG) and LPG (propane or butane) burn differently, so they require different jet sizes:

• Natural Gas Jets: Larger holes because NG has lower energy density.
• LPG Jets: Smaller holes because LPG burns hotter and needs less gas flow.

This is why NG and LPG jets cannot be swapped unless you are doing a proper conversion.

Replacing Your Existing Natural Gas or LPG Jets

If you are simply replacing worn or damaged jets, the process is very easy:

1. Remove your old jet.
2. Check the number stamped on the side.
3. Buy a replacement with the exact same number.

If the number matches, the jet will work. Brand does not matter — the size does.

Converting Between Natural Gas and LPG

You can convert most cookers and hobs between NG and LPG by installing the correct jet set. The conversion types are:

• NG → LPG conversion: Install smaller LPG jets.
• LPG → NG conversion: Install larger natural gas jets.

Each burner needs its own size. A typical hob includes a mixture of:

• Small burner jet (e.g., 50–55 LPG / 70–90 NG)
• Medium burner jet (e.g., 65–75 LPG / 90–110 NG)
• Large burner jet (e.g., 85–100 LPG / 120–150 NG)
• Wok jet / Rapid burner jet (largest size)

A full conversion kit supplies the correct sizes for each burner.

Step 1: Identify Your Cooker Brand and Model

The easiest way to choose the right jet kit is by knowing the brand and model number (e.g., Smeg PTV64, Zanussi ZGH66424, Lamona LAM1212). Manufacturers design burners with specific gas flows, so matching your model is ideal.

Step 2: Match the Jet Numbers

To replace worn jets, always match or swap based on the stamped number:

• Replacing jets: Match the same number.
• Converting to LPG: Refer to the Injector Table in your appliances manual to get specific sizes for the specific burners.
• Converting to NG: Refer to the Injector Table in your appliances manual to get specific sizes for the specific burners.

Never guess the sizes. The numbers must be correct for safe and efficient burning.

Step 3: Installation & Gas Safety

To install gas jets, normally you need only:

• A small spanner

Important: In the UK, all gas work must legally be carried out by a Gas Safe registered engineer.

Where to Buy Replacement Jets and Conversion Kits

At LPGJets.com, we supply:

• Natural gas jets (NG)
• LPG jets (propane & butane)
• Full NG ↔ LPG conversion kits
• Full LPG ↔ NG conversion kits
• Single replacement jets
• Universal multi-size jet packs

Benefits:

• Fast UK delivery
• Same-day dispatch before 3:15pm (Mon - Fri) Before 12pm Saturday.
• Exact size matching for all major brands
• 30+ years of gas appliance experience

Need Help Choosing the Correct Jets?

If you're unsure whether you need natural gas jets, LPG jets, or a full conversion kit, contact us anytime. We will help you identify the correct jet sizes for your cooker or hob.

Whether you pick up the phone to call us, email us or use the chat button on the website we will be happy to guide you to what you require!

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