Free tools for
the trade.
Diagnostic tools, calculators, and reference guides — built by a Gas Safe engineer for everyday use on the tools. No login, no paywall.
AVAILABLE NOW
Boiler Fault Finder
Got a fault code on the display? Describe a symptom? Get an instant diagnosis with likely causes, first checks, and urgency rating. Covers 10 brands and 90+ fault codes.
Worcester · Vaillant · Baxi · Ideal · Glow-worm · Potterton · Ferroli · Alpha · Viessmann · Navien
Radiator BTU Calculator
Calculate room heat loss in watts and BTU/hr. Get radiator sizing recommendations for gas boilers and heat pumps with automatic output correction for flow temperature.
Gas boilers · Heat pumps · ΔT50 correction · BS EN 12831
Pipe Sizing Calculator
Enter boiler output or flow rate — get recommended copper pipe size with velocity check and pressure drop. Heating circuits, cold and hot water supply.
15mm · 22mm · 28mm · 35mm · CIBSE Guide C · Darcy-Weisbach
Day Rate Calculator
Target take-home + overheads + tax = your exact day rate and hourly rate. Built for sole trader plumbers and heating engineers who want to price properly.
Sole trader · income tax + NI · van + overhead costs · UK market benchmarks
Website ROI Calculator
Is a website worth it? Enter your average job value — see how many extra jobs it needs to pay for itself, your year 1 ROI, and 5-year revenue potential. Includes Checkatrade comparison.
Break-even · ROI % · 5-year potential · vs Checkatrade
Quote & Invoice Generator
Enter your labour hours, materials, and customer details — download a professional PDF quote or invoice in seconds. Business details saved so you're ready to go every time.
Labour · Materials · VAT · Bank details · PDF download · £19 full access
COMING SOON
System Flush Checklist
Step-by-step powerflush and chemical flush procedure guide.
FOR HEATING ENGINEERS
Free tools bring them in.
Your website closes them.
Homeowners searching for fault codes at 9pm are looking for someone trustworthy to call. A website that ranks locally, loads fast, and converts enquiries is how you turn those searches into booked jobs — without Checkatrade fees.