A study carried out by Worcester Bosch Group'stechnical support team found that the most common cause of a boilerinstallation problem was from incorrectly sized gas pipes. Whenfitting a new boiler, often the existing pipes should be replacefor larger ones due to the increased output. Smaller pipes willmean the boiler is running at a lower power and can cause anincrease in carbon monoxide levels.The Gas Pipe Sizing Calculator is an extremely easy to use appthat will help you to select the right size pipes for installationsusing copper (up to 108mm), steel (up to 300mm) and PE (up to315mm) pipes of sections up to 250m (820ft) in length.To carry out a calculation simply select the gas type, enter theappliance heat input, enter the pipe length, the number of high orlow loss fittings (guidance is given in the app), select the typeof pipe and then press the 'Calculate' button.The results will show the total equivalent length, the minimumpipe diameter (metric) that should be used and the pressure dropfor that section of pipe.For multiple appliances each section should be calculated inturn and the kW inputs for the appliances in each section addedtogether for each calculation.The maximum pressure drop from each appliance to the metershould be no more than 1 mbar for natural gas or 2.5 mbar forbutane or propane. Adding all drops together using the minimum pipediameters may cause this to be exceeded. Where possible, theresults will also calculate the drop if the next larger size pipediameter is selected on a section, this should help to ensure theright sizes are used throughout the whole circuit.Please note: This app is designed mainly for the UK so supportsmetric pipe sizes only.

This is a the Lite version of Mr Combi's GasRate Calculator & Guide. It supports natural gas with a metricmeter only.Input the initial meter reading, use the built-in 2 minute timerand then input the final reading. Press the calculate button andthe results will then be displayed on the screen.Gas rates are given in cubic metres per hour, litres per second andcubic feet per hour. Gross and net heat inputs are given in MJ perhour, kilowatts and BTUs per hour.If you like this app then please purchase the full version whichhas the following extra features:1. Built-in guide with full gas rate calculations andlet-by/tightness testing procedure2. Built-in conversion calculator3. Built-in let-by/tightness testing timers4. Works on all types of meter5. Metric and imperial calculators6. Supports natural gas, butane and propane7. Built-in torch8. Save manual calorific values for improved accuracy9. Select between a 1 and 2 minute timer for metric meters10. Selectable timer alert11. Supports ¼ft³, ½ ft³, 1ft³, 2ft³ and 5ft³ imperial testdials12. Email results to any destination or share to other apps such asDropBox and Drive13. No ads

The easy to use Gas Ventilation Calculatorwill help you find the required ventilation sizes for domesticflueless, open flue and room sealed appliances up to 70kW (net). Italso supports multiple rooms, multiple appliances and includes anextractor fan calculator and a vent size calculator.Flueless:This calculator will find the required vent size for fluelessappliances such as cookers, grills, water heaters and spaceheaters. Enter the dimensions of the room and the heat input of theappliance and the calculator will find the vent size required oradvise if no vent is needed or that the appliance should not befitted in that room.Open Flue:Enter the appliance heat input and select whether adventitious airis available or if the appliance is in a compartment and thecalculator will find the required vent sizes.Multiple Rooms:For an open flue appliance where the path to outside is via anotherroom use the 'Walls to outside' option within the Open FlueCalculator to select the number of walls vents need to be fittedinto. It will also take into account adventitious air or if theappliance in a compartment as per the selected options.Room Sealed:For a room sealed appliance simply enter the heat input and thecalculator will find the vent sizes required if the appliance is ina compartment.Multiple Appliances:For multiple appliances in one room this app simply providesguidance to remind you of the regulations. The other calculatorswill then need to be used to find the required vent size.Extractor Fan:To find the required performance of a fan for a room enter the roomdimensions and type and the performance will be found using pre-setair change rates. A manual ACH can be entered also.Vent Size:A calculator is included to find the total size of a vent withrectangular or circular holes.

Following Mr Combi's hugely successful one dayfault finding course and DVDs, this application will help you useyour multimeter effectively. It will show you how to ensure aboiler is safely installed, safe to work on and conforms to BS7671.It can also help you to identify the cause of faults!The app has four parts: the Electrical Safety Tests, a MultimeterGuide, an Ohm's Law Calculator and an Ohm's Law Guide.★★★ Electrical Safety Tests ★★★The app will show you how to carry out all of the tests from startto finish to help you make sure the boiler is completely safe. Thetests should be completed after an installation (before switchingon the appliance) or before carrying out any work on an existingboiler. Each test contains easy to understand images to make itmuch simpler to follow. Many electrical faults can be identifiedfrom the tests and the Fault Isolation page should help you to findthe cause.There are six parts, these are:• Before Starting• Earth Continuity Test• Short Circuit Test• Resistance to Earth Test• Polarity Test• Fault IsolationWe asked someone who had never used a multimeter to use the app andthey were able to carry out the tests with ease!★★★ Multimeter Guide ★★★To help you to get a better understanding of how to use yourmultimeter, this app includes a multimeter guide. It consists ofthe following parts:• Multimeter types• Multimeter settings (those settings needed when working onboilers)• SI Prefixes (to help you understand the multimeter results)• Know your multimeter (so you will know what to look for on yourown multimeter)★★★ Ohm's Law Calculator ★★★Our very popular Ohm's Law Calculator is included in this app. It'sextremely easy to use; enter two known values, press the'Calculate' button and the other two values will be enteredinstantly. If more calculations are required, each single entry boxcan be cleared using the corresponding 'X' button or press 'Reset'to clear all four boxes.★★★ Ohm's Law Guide ★★★If you're a beginner with electrics the Ohm's Law Guide will helpto give you a better understanding of the calculations. The firsttwo pages will explain Ohm's and Watt's Laws, page 3 explains howto add together resistances in series and parallel and the lastfour pages contain every possible formula for conversions betweenvoltage, current, resistance and power.A complete Ohm's Law reference guide you can take with you -wherever you go!

This is an Ohm's Law Calculator with a built-in mini-guide to referto if required. The calculator is very easy to use, enter two knownvalues, select the units, press 'Calculate' and the other twovalues will be displayed instantly! The guide contains 7 parts: •Ohm's law • Watt's law • Adding resistances • Voltage formulae •Current formulae • Resistance formulae • Power formulae If you wantto be able to understand how the Ohm's law calculations are carriedout, or would like a handy reference guide, this is the app foryou!

Work on combi boilers? You need this app!

Everything you need to know about Danfoss & Honeywell controls

Use the Gas Ratio Calculator to process the results from yourGasFlue Analyser and find the CO/CO2 ratio for natural gas. Iftheboiler is running efficiently there may be no need to serviceit.Simply test the boiler with your analyser and obtain theoxygen,carbon monoxide and carbon dioxide values. Input the valuesfromthe analyser into the Gas Ratio Calculator, the CO/CO2 ratiowillbe calculated and advice also given on whether the boilershould beserviced or not. Once you have your results you can emailthemdirectly from within the app or export them to another appthatsupports text files, such as Dropbox, Google Drive or Evernote.