# GB Gas Heat Input Calculator — user reviews > 56 indexed App Store user reviews of GB Gas Heat Input Calculator by GB-GAS.CO.UK. - Source: https://appshunter.io/ios/app/gb-gas-heat-input-calculator/id426032737/reviews - App overview in markdown: https://appshunter.io/ios/app/gb-gas-heat-input-calculator/id426032737.md ## Newest reviews (10 of 56) ### 4/5 — Perfect but *2020-08-27* Works flawlessly for me but a new update changed the colour scheme. Red text on black background is way harder to read ### 3/5 — App crash *2019-11-25* It works ok. But when you go to info button. It won’t go back to main screen. It just freezes on page turn screen. ### 4/5 — Nice app *2017-01-24* Have used the free version on iPhone. Reason for changing to the paid version is that the stopwatch responds immediately compared to the free one and appears to lag. ### 1/5 — Ios10 update fail *2016-09-30* Used this app for around 3 years. All has worked well until new ios10 update. The app is not full screen. Need to review the update and fix the bug ### 4/5 — iOS 10 app crash *2016-09-27, version 2.2* Good app better than some of the big named brand ones but now I can't use as the app crashes every time since iOS 10 update hope you get it fixed soon 😭 ### 1/5 — Does not work with iOS 10 *2016-09-20, version 2.2* When entering 2nd meter reading, the app will crash and phone reverts back to home screen. Click back into app and the timer has reset and 1st meter reading wiped. ### 2/5 — Needs Update! *2016-09-18, version 2.2* Needs an update as it crashes after around 10 seconds into a test using iOS10. ### 1/5 — Timer is slow by 5 seconds at least *2015-11-27* Please can you look into your app timer as it is slow and giving inaccurate gas rate when testing over 2 minutes to gas rate a boiler I have had to take first read from meter than start my phone stopwatch then enter second reading after two minutes then use your calculator... Please get this issue resolved asap ### 4/5 — OLG Heat *2015-11-09, version 2.2* Really good App that's become a big part of my toolkit. ### 5/5 — Quality tool box essential *2015-09-05, version 2.2* Simple to use, only thing that would complete this app would be the addition of lpg gas rate option. ## Most critical reviews (10 lowest-rated) ### 1/5 — Poor visual interface. Poor response *2026-07-04* Unreadable instruction page unless you have lazer vision. App seems to be working but not very user friendly. ### 1/5 — Need to review *2021-07-29* It seems it doesn’t do the right calculations the results are far from what should be ### 1/5 — Crashes in iOS10 *2020-08-26, version 5* I've used this app for years with no problem, it was brilliant but since the latest update it’s absolute rubbish! .576 to .678 works out at 21.54kwn? I don’t think so! It should be more like 30.4kwn. I hate the new one button set up! Previous version was much better! Sort it out GB!!!🙏🙏🙏 ### 1/5 — Crashes a lot *2020-08-25* Used to be good, but since change of layout, stopped using. ### 1/5 — No longer works *2020-08-24* Update has made the app no longer work! Can’t hit a calculate button ### 1/5 — Ruined *2020-07-29* Was one of the best apps I used for gas rating until the latest update Now it’s ruined. Please go back to the old version. ### 1/5 — Not good since update *2020-07-28* Since update it is rubbish. Now deleted ### 1/5 — They have changed it!!! *2020-07-23* WHY!!!!! It’s rubbish now! ### 1/5 — Rubbish *2020-07-23* New format is rubbish, looses data when reopened aswell👎👎old format was great!! ### 1/5 — Doesn’t fully work *2020-07-21* Doesn’t display heat input in gross or net. Just reads 0 after calculating ## Most praised reviews (10 highest-rated) ### 5/5 — Brilliant *2020-07-22* Have used this app now for a couple of years and it’s been very reliable and acceptable. However since it’s recent update it is even better. Excellent app. Well recommended ### 5/5 — Good app liked older version better *2016-09-29* Have used this app since I first got an iPhone 4 works really well unless meter is in the .900 then meter resets to zero it wont calculate it but not a prob at all. The new updated version for ISO 10 is no longer full screen old version was much nicer not sure if this can be sorted but will continue to use it as I love the app. ### 5/5 — Excellent gas rating tool *2016-09-14, version 2.2* I would highly recommend this tool as its so simple to use ### 5/5 — GB Gas Calculator *2016-06-29, version 2.2* Fantastic. Easy to use. ### 5/5 — Great app *2016-04-16, version 2.2* Easy to use and dose the job, this is a great app well worth a download ### 5/5 — R Nice app *2016-02-29, version 2.2* V Good ### 5/5 — Gas rate *2016-02-13, version 2.2* Quick and easy to use. You cant use on exams as i was told last week while renewing my ccn1. Going to down load ventilation next ### 5/5 — Andy *2015-12-11, version 2.2* Very good had this app for a few years now Highly recommend ### 5/5 — Excellent *2015-11-22, version 2.2* Works perfectly!! 👍🏻 ### 5/5 — Does what it says easily *2015-10-20, version 2.2* A gadget that helps smooth the day --- *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 2026-08-15.*