250+ iOS apps curated and reviewed
Every iPhone needs a few good radiatoroutput apps. We benchmark 250+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | — | No | No | Aug 2026 | |
| 2 |  | Free | — | No | Yes | Sep 2026 | |
| 3 |  | $4.99 | 1.5★ (2) | No | No | Sep 2026 | |
| 4 |  | Free | 4.6★ (1.2K) | Yes | No | Sep 2026 | |
| 5 |  | Free | 5.0★ (1) | No | No | Jun 2026 | |
| 6 |  | Free | 5.0★ (159) | No | No | Sep 2026 | |
| 7 |  | Free | 4.2★ (185) | No | No | Aug 2026 | |
| 8 |  | Free | 4.8★ (52) | No | No | Aug 2026 |
Calculate radiator heat output based on water and air temperatures. Ensure optimal energy efficiency and cost savings by selecting the correct radiator size for any heating system, including those with low water temperatures. Supports metric units and can also calculate cooling output for convectors and fan-coils.
Accurately calculate the heating requirements for any room in your home. This tool supports unlimited rooms, offers precise calculations in Watts and BTU, and features a clean, intuitive design with dark mode support.
Calculate room heat loss, estimate radiator output, and convert between Watts and BTU/h. Analyze potential energy savings from home improvements and determine radiator sizing for optimal heating. Results can be emailed, saved, or exported.
