# Radiator / BTU Calculator — user reviews > 34 indexed App Store user reviews of Radiator / BTU Calculator by Claire Holmes, rated 1.00/5 from 1 ratings. - Source: https://appshunter.io/ios/app/radiator-btu-calculator/id397251605/reviews - App overview in markdown: https://appshunter.io/ios/app/radiator-btu-calculator/id397251605.md - Rating breakdown: 5★ 0 · 4★ 0 · 3★ 0 · 2★ 0 · 1★ 1 ## Newest reviews (11 of 34) ### 3/5 — Good app but won’t open anymore. *2023-03-06, version 7.0.0* Good app but it is no longer opening on iPhone 13pro iOS 16.3.1. Please provide solution ### 2/5 — Fix please *2021-03-29, version 7.0.0* Was great but won’t open these days. Please fix. ### 2/5 — UPDATE REQUIRED!!! *2015-12-02, version 003* The app used to be great but now just won't load surely it's an easy fix by the developer? ### 2/5 — Was great, now doesn't even open *2015-10-25, version 003* Sort out the update! I use this app all the time. ### 1/5 — This app doesn't download!!! *2015-10-24, version 003* Just paid £1.49 for this app & it won't download! Also I can't report the problem because I seemingly don't have "JavaScript". Don't waste your money!! I have to rate this app, but it doesn't deserve the 1 star that I have to give. ### 1/5 — Terrible since ios9 *2015-09-30, version 003* At first since the update I'd get completely different answers for the same size room now I can't even open it. Great app until the update now it's useless ### 2/5 — Not working *2015-09-28, version 003* Needs updating Can not get btu to price job up ### 3/5 — Well it was 5 stars *2015-09-23, version 003* Worked great until the iOS 9 update and now does not work at all, please update. ### 3/5 — Was very good *2015-09-21, version 003* Was a brilliant app until ISO 9.0 came out and now the app has crashed and doesn't work ### 1/5 — A j Smith *2012-11-29, version 003* Very suspicious today after calculating the total wattage of a bathroom I'm working in......with a second opinion from a "Mears" calculator I found the result from this App to have a 1600 watt discrepancy!!! I have since done a check on a further 17 rooms and all were way way out from the Mears....and Mears over size!!!! ### 3/5 — Great time saver. *2011-11-29, version 003* Great time saver. Would be nice to see it for iPad. ## Most critical reviews (10 lowest-rated) ### 1/5 — Help *2024-09-25, version 7.0.0* Just Purchased App and it will not open? ### 1/5 — Doesn’t Work *2023-06-22, version 7.0.0* I have just paid £1.99 for this and it doesn’t open, please fix ### 1/5 — Don’t spend your money *2022-09-01, version 7.0.0* Should have read the reviews first - just bought it and it doesn’t load. Shame looked like a good - just what I was looking for ### 1/5 — Does not work *2022-06-05, version 7.0.0* Paid to use this app does not work all you get is a picture of a dog ### 1/5 — Useless *2022-05-05, version 7.0.0* Utterly useless ### 1/5 — Useless *2022-02-05, version 7.0.0* I purchased this app. It is not even opening. What a joke. If I could rate something below one, I would rate it. ### 1/5 — The app keeps crashing??? Won't start up *2021-03-22, version 7.0.0* The app keeps crashing??? Won't start up ### 1/5 — My btu *2019-10-16, version 7.0.0* Does not even open since update old Blue one used to work ### 1/5 — App won't start *2015-12-30, version 003* App doesn't even start after multiple reloads. Has it been updated for new iOS? This appears to have been a waste of money. ### 1/5 — App wont open *2015-10-28, version 003* Well paid for the app and it wont bloody open so i want a refund ## Most praised reviews (10 highest-rated) ### 5/5 — Spot on *2012-01-27, version 003* Does the job spot on. ### 5/5 — Great App for any one in the trade *2011-06-09, version 003* I have checked this app against our charts and its spot on Only comment - it needs a northern and southern hemosphere version for use in Australia... ### 5/5 — Great app! *2011-04-14, version 003* Great app for heating engineers ### 5/5 — 10 out 10 the best time saving app i ever bought *2011-01-19, version 003* This app is really great. It saves me loads of time and is well worth the money. Great if your in the trade. ### 5/5 — Brilliant - saved me a lot of hassle *2010-11-30, version 001* Brilliant app - I always wondered why my living room was colder than it should have been even though my house is a new-build. I downloaded the app, entered in a few numbers and found out to my surprise that the radiators that had been supplied were smaller than they should be. After showing the site manager my finiding they soon backed down and im getting a new radiator this week! Yeah..... I'm going to do the same with the rest of my rooms to make sure all the other radiators are correct. SImple to use and it works. Im going to suggest my friends do the same. ### 4/5 — Please update *2020-09-15, version 7.0.0* Perfect simple little app, nothing else like it, now won’t open at all, imagine needs updating 😩 ### 4/5 — Update Please *2015-11-18, version 003* Until the new ios9 the app worked fine. Can we please have an update! Won't even open now at all... ### 4/5 — Plumbing and heating *2015-10-21, version 003* Please please please can we have a update for the app worked fine till ISO 9 now won't even open this is why 4 stars would have been 5 only no updates ### 4/5 — Mr *2015-09-29, version 003* Great app before ios9, please update soon ### 4/5 — Simple, clear and effective *2014-01-04, version 003* User friendly, fast, simple. Always perform 2 calcs using 2 different systems and use median result, as results vary. --- *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 2026-06-10.*