What Size Air Compressor Do I Need? UK Buyer's Guide

Whether you're a first-time buyer or upgrading from an old compressor, choosing the right size air compressor can feel overwhelming. Tank sizes, CFM ratings, bar pressure, oil-free vs oiled — there's a lot to consider. This guide cuts through the jargon and helps you choose the right compressor for your tools, your workspace, and your budget.

The short answer: The right size compressor depends on three things — what tools you're running, how many tools you're running at the same time, and how continuously you need to run them. Get these three things right and you'll never under or overbuy.

Step 1 — What Tools Are You Running?

Every pneumatic tool has a CFM (Cubic Feet per Minute) or L/min requirement — the amount of air it needs to operate properly. Here are the most common tools and their air requirements:

The golden rule: your compressor's FAD (Free Air Delivery) must be higher than the CFM requirement of your tool. If your compressor can't keep up with the tool's demand, pressure will drop and performance will suffer.

Step 2 — How Many Tools Are You Running Simultaneously?

Running one tool at a time? A smaller compressor will do the job. Running multiple tools at the same time — like on a busy job site — you need to add up the CFM requirements of all the tools running together.

For example: a framing nailer (2.4 CFM) + medium HVLP spray gun (5.0 CFM) = 7.4 CFM total. Your compressor needs to deliver at least 7.4 CFM at working pressure to keep both tools running without dropping pressure.

Step 3 — How Continuously Do You Need to Run?

This is where tank size matters. A larger tank stores more air — meaning the compressor motor cycles on less frequently to top up the pressure. For continuous heavy use like spray painting a whole car or running a sander for hours, a larger tank keeps pressure more consistent and reduces motor wear.

For intermittent use — firing a nail gun occasionally or inflating a tyre — a smaller tank is perfectly adequate because the compressor has time to recover between uses.

Which TEH Tools Compressor Do You Need?

Quick Buying Guide by User Type:

Home DIYer: You're inflating tyres, occasionally firing a brad nailer, and doing the odd touch-up spray job. The TAC24L is perfect — compact, quiet at 75-80dB, and handles everything a home DIYer needs.

Light Trade: You're a tradesperson using nailers, spray guns, and air drills on site. The TAC50L-M1 gives you a 50-litre tank and clean oil-free air — enough for a full day's work across most trade applications.

Professional Workshop: You're running HVLP spray guns, framing nailers, and multiple tools. The TAC50L Twin Motor with 200 L/min FAD at 8 Bar handles everything a busy workshop or professional trade site demands.

Industrial & Bodyshop: You need continuous high-volume airflow for orbital sanders, full-size spray guns, and multiple operators. The TAC100L or TAC130L are built for exactly this — triple and quad motor configurations with intelligent controllers.

Common Mistakes to Avoid:

• Buying on tank size alone — a 50L compressor with low CFM output is worse than a 24L compressor with high CFM output for continuous tool use
• Ignoring FAD figures — max displacement figures are theoretical; always check the FAD at working pressure
• Underbying for future needs — if you think you might add more tools later, size up now
• Forgetting about noise — if you're working at home or in a residential area, check the dB rating. Our TAC24L at 75-80dB is significantly quieter than most compressors in its class