GB Gas Rate Calculator

GB-GAS – Professional Gas Engineering Tools, designed by engineers for engineers. Commission gas appliances with confidence using GB-GAS Heat Input Calculator.

GB-GAS Heat Input Calculator No Adverts

The professional gas rate and heat input calculator designed specifically for qualified gas engineers, heating engineers, commissioning engineers, service engineers, trainers, assessors and apprentices.

Developed by GB-GAS using many years of practical industry experience, this professional application provides a fast, accurate and easy-to-use method of calculating appliance gas rates and heat inputs while producing clear commissioning results.

Whether you are carrying out routine servicing, commissioning a new installation, fault finding or checking appliance performance, GB-GAS Heat Input Calculator Professional guides you through every stage of the testing process.

Unlike simple gas rate calculators, this application provides a structured commissioning workflow that mirrors the way professional engineers work on site.

Professional Features

• Accurate gas rate calculations

• Net and Gross Heat Input calculations

• Suitable for Natural Gas and LPG installations

• Manufacturer data entry

• Automatic comparison of measured results against manufacturer specifications

• Automatic tolerance calculations

• High Fire and Low Fire testing

• Cooker Grill and Oven testing

• Large professional stopwatch

• Test duration quality assessment

• Professional commissioning summary

• PDF report generation

• Print, Share and Save to Photos

• Clean step-by-step workflow

• Designed specifically for field use

• No adverts

• No subscriptions

Simple Step-by-Step Workflow

The application guides the engineer through each stage of the commissioning process.

Step 1

Select the appliance type.

Choose from:

• Boiler

• Cooker

• Other Gas Appliance

The application automatically configures the correct testing sequence.

Step 2

Enter the manufacturer information.

Input manufacturer values using:

• Net Heat Input

• Gross Heat Input

or

• Gas Rate

Manufacturer information can be entered before testing or skipped if not available.

Step 3

Carry out the gas rate test.

The large digital stopwatch makes timing easy to read even in poor lighting conditions.

Results are automatically calculated for:

• Gas Rate

• Net Heat Input

• Gross Heat Input

Before accepting each test the application allows you to confirm the result or immediately restart the timing process if required.

Intelligent Commissioning

Once testing has been completed the application automatically compares your measured values with the manufacturer's data.

Results are displayed clearly showing:

Manufacturer Value

Measured Value

Percentage Difference

Pass or Fail indication

Acceptable commissioning tolerance

This provides immediate confirmation that the appliance is operating within expected performance limits.

High Fire and Low Fire Testing

For boilers the application automatically guides you through:

Reports provide a clear record of the commissioning results and measured appliance performance.

Why Choose GB-GAS?

GB-GAS has been producing professional gas engineering training materials, technical publications and engineering software for many years.

Every feature within this application has been developed using real-world engineering experience to provide a workflow that is practical, accurate and simple to use.

Rather than simply providing a calculation, GB-GAS Heat Input Calculator Professional helps engineers complete a structured commissioning process from start to finish.

Time the Metric meter for two minutes, input the first and second reading, press calculate and your answer is there. For imperial meters time one revolution then convert the time into seconds. input that time, press calculate and your answer is there. No more looking up charts or using long winded calculations... Its so simple