Help Centre | TradeHelp

Multi Appliance Gas Pipe Sizing is designed to provide correct gas pipe sizes for up to 4 different appliances based on a domestic gas meter.

All calculators are designed to be used on site and available from the Toolbox section of the TradeHelp mobile app.  

TradeHelp App for mobile

  1. Select Toolbox from the main menu
  2. Go to Heating Calculators and select Multi Appliance Gas Pipe Sizing
  3. Select the number of appliances 1 – 4
  4. Enter the KW output of each appliance in the boxes adjacent to the orange pipe
  5. Enter the length of pipe (metres) and the number of bends, elbows and tees in the sections labelled along the pipe (eg M to A), working through each section listed

N.B For the most accurate result, if there is a Tee always include it in the measurement of the branch to the appliance (eg not M – A, but in A – B)

  1. Select Get Results
  2. The results will show the size of the pipe required in each section and give the pressure drop associated with that sizing when the appliances are working to maximum capacity
  3. Select Done to restart
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