TomKat engineer toolkit
Which tool do you need?
Free calculators and on-site helpers for gas engineers.
View all toolsCalculators
Most usedIGEM UP/1B CalculatorCalculate installation volume, purge volume and permitted pressure drop using IGEM/UP/1B Edition 4.Open tool ↗
Gas Rate CalculatorConvert timed meter readings into an appliance gas rate quickly on site.Open tool ↗Radiator Sizing AssistantEstimate radiator output requirements using room dimensions and property details.Open tool ↗On-site support
Tightness Test HelperWork through let-by and tightness testing with structured on-screen support.Open tool ↗
Ventilation AssistantCalculate ventilation requirements for common domestic gas appliances.Open tool ↗
Fault Finding AssistantFollow a practical diagnostic route when an appliance is not operating correctly.Open tool ↗Service and CP12 ChecklistUse a clear sequence for appliance servicing and landlord gas-safety checks.Open tool ↗From the Engineer Shop
Choose around the work you do.
CommissioningBoiler Commissioning BundleU-Flow gauge, stem thermometer, voltage detector and probe adaptor. Compare the contents with what you already carry.View bundle ↗
Tightness testingU-Gauge Top-Up BundleGauge, fluid and leak detector. Already have a suitable gauge? You may only need consumables.View bundle ↗
Sealed heating systemsExpansion Vessel Service BundlePressure checker, service valve and leak detector for heating-system work. Check the valve suits your system.View bundle ↗Free ACS reminder
Get a reminder before your ACS expires.
Use these tools as practical support
Always apply your own competence, current industry standards, manufacturer instructions and site-specific information before carrying out work.