# Gas Pipe Sizing Calculator

> Calculates correct gas pipe sizes for boiler installations. (iPhone/iPad app by Mr Combi Training.)

- Source: https://appshunter.io/ios/app/gas-pipe-sizing-calculator/id570414217 (this page in markdown: same URL + `.md`)
- Developer: [Mr Combi Training](https://appshunter.io/developer/566867832)
- Category: Productivity, Utilities
- Price: $4.99
- Rating: 4.00/5 from 1 App Store ratings · 14 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 1 MB
- Languages: American English
- Released: 2012-11-21
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/gas-pipe-sizing-calculator/id570414217/reviews.md

## What is Gas Pipe Sizing Calculator?

A study carried out by Worcester Bosch Group's technical support team found that the most common cause of a boiler installation problem was from incorrectly sized gas pipes. When fitting a new boiler, often the existing pipes should be replace for larger ones due to the increased output. Smaller pipes will mean the boiler is running at a lower power and can cause an increase in carbon monoxide levels.

The Gas Pipe Sizing Calculator is an extremely easy to use app that will help you to select the right size pipes for installations using copper (up to 108mm), steel (up to 300mm) and PE (up to 315mm) pipes of sections up to 250m (820ft) in length. 

To carry out a calculation simply select the gas type, enter the appliance heat input, enter the pipe length, the number of high or low loss fittings (guidance is given in the app), select the type of pipe and then press the 'Calculate' button. 

The results will show the total equivalent length, the minimum pipe diameter (metric) that should be used and the pressure drop for that section of pipe.

For multiple appliances each section should be calculated in turn and the kW inputs for the appliances in each section added together for each calculation.

The maximum pressure drop from each appliance to the meter should be no more than 1 mbar for natural gas or 2.5 mbar for butane or propane. Adding all drops together using the minimum pipe diameters may cause this to be exceeded. Where possible, the results will also calculate the drop if the next larger size pipe diameter is selected on a section, this should help to ensure the right sizes are used throughout the whole circuit.

Please note: This app is designed mainly for the UK so supports metric pipe sizes only.

## Key features

- Select pipe size based on gas type
- Enter appliance heat input
- Specify pipe length and fittings
- Supports copper, steel, and PE pipes
- Calculates minimum pipe diameter
- Shows pressure drop for pipe sections

## Recent user reviews (10 of 14)

All indexed reviews: https://appshunter.io/ios/app/gas-pipe-sizing-calculator/id570414217/reviews.md

### 1/5 — Only seems useful for 1 appliance

*2024-11-07*

This app only seems useful for 1 appliance, it doesn’t seem of any use at all when needing to size a normal domestic set up with a gas fire, cooker & boiler (for example.). I know how to input the data but there’s no  tutorials and weirdly the input sections and summary are written in black ink with a black background or white ink style with a white background making it very difficult to read

### 5/5 — Colin

*2018-09-27*

Does exactly what it says on the can. Ideal quick calculator without getting bogged down with complicated charts.
Another reviewer commented that you’d have to know exactly what you’re doing to use this app.......I should hope so, you want non gas registered people installing your gas supply pipe work?????

### 3/5 — Basic pipe calculator

*2017-03-19*

Basic straight length calculator where it is up to the user to calculate effective pipe length and make their own allowance for bends and fittings.

The user will need to do a carcass drawing and note pressure drop and check index runs do not exceed 1mb drop on nat gas.

Tends to allow pressure drop of up to 0.5mb on each length and would be useful if it calculated down to .15 drop as if you various branches on larger pipe work.

This needs to be used by someone that knows exactly what they are doing.

Have used others where the carcass could be input inc branches and end loads and then changes made automatically resize whole project.

### 5/5 — Very good

*2014-11-12*

Fast and easy to use on site. Excellent

### 1/5 — Don't waste your money

*2014-03-26*

Don't waste your money call you local plumbing supply for help,this is just the waste!!!

### 5/5 — Very clear app. easy to use.

*2013-11-10*

Purchased this to help with sizing and it is brilliantly simple. Good app.

### 1/5 — Doesn't work.

*2013-05-13*

Cannot calculate over 98 feet. This does no good for what is needed in my job applications. A refund would be greatly appreciated.

### 1/5 — Rubbish

*2013-02-18*

Wanted a quick guide for 110kw 3 boilers in industrial building. The app stops at 30m! 
DO NOT WASTE YOUR MONEY!

### 1/5 — What's the point

*2013-02-01*

What good is this app with a max distance of 30m including fittings I can work that out easily I purchased this app for non standard installations not the everyday you require 22mm pipe jobs ?

### 1/5 — POS

*2013-01-11*

Metric crap!
Very limited!

## Frequently asked questions about Gas Pipe Sizing Calculator

### What is the Gas Pipe Sizing Calculator used for?

The Gas Pipe Sizing Calculator is used to determine the correct size of gas pipes needed for boiler installations. It helps prevent issues caused by incorrectly sized pipes, which can affect boiler performance and safety.

### What types of pipes does the Gas Pipe Sizing Calculator support?

The app supports calculations for copper pipes up to 108mm, steel pipes up to 300mm, and PE pipes up to 315mm in diameter.

### What information do I need to enter into the Gas Pipe Sizing Calculator?

You need to select the gas type, enter the appliance heat input (kW), the pipe length, the number of high or low loss fittings, and the type of pipe you are using.

### What results does the Gas Pipe Sizing Calculator provide?

The results include the total equivalent length of the pipe section, the minimum required pipe diameter in metric units, and the pressure drop for that section.

### Is the Gas Pipe Sizing Calculator available for free?

No, the Gas Pipe Sizing Calculator is a paid application. It is priced at $4.99 and is available for iPhone, iPad, and iPod touch.

### How often is the Gas Pipe Sizing Calculator updated?

The latest version of the Gas Pipe Sizing Calculator is 2.7, which was last updated on April 28, 2023. This indicates regular maintenance and potential feature improvements.

### Does the Gas Pipe Sizing Calculator have ads?

No, the Gas Pipe Sizing Calculator does not contain advertisements. Users can utilize its features without interruption from ads.

### What is the user rating for the Gas Pipe Sizing Calculator?

The Gas Pipe Sizing Calculator has a rating of 4.0 stars based on one review. This suggests a generally positive user experience among its current users.

## Version history (last 5 releases)

### 2.7 — 2023-04-28

- Upgrade the app 
- Remove some sections.

### 2.6 — 2023-04-20

We have updated this APP to make it load better on different devices

### 2.5 — 2018-12-05

We've made some small tweaks for iOS 12.

### 2.4 — 2015-08-05

iOS 8 users now get some useful extra buttons when entering data

### 2.3 — 2014-11-26

A couple of tweaks and now the app supports the iPhone 6 and 6 Plus.

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## More apps by Mr Combi Training

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All apps by Mr Combi Training: https://appshunter.io/developer/566867832

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*