221+ iOS apps curated and reviewed
Hotstart Heater Sizing App is the household name in hotstart heater sizing app, but it's far from the only option. We track 221+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 5.0★ (2) | No | No | May 2026 |
| 2 |  | Free | 4.4★ (14K) | No | No | Jul 2026 |
| 3 |  | Free | 4.1★ (8K) | No | No | Jul 2026 |
| 4 |  | Free | 4.4★ (12K) | No | No | Jul 2026 |
| 5 |  | Free | 2.5★ (292) | No | No | Jul 2026 |
| 6 |  | Free | 4.9★ (19K) | No | No | Jul 2026 |
| 7 |  | Free | 4.6★ (7.5K) | No | Yes | Jul 2026 |
| 8 |  | Free | 4.3★ (75K) | No | No | Jul 2026 |
This application helps users select the optimal engine heater for industrial applications. It considers factors like fluid type, environmental conditions, and power requirements to provide a recommended solution. Users can then contact the developer to confirm their heater choice.
Manage your home's heating, cooling, and hot water systems remotely. Optimize energy usage, set custom schedules, and receive important alerts for maintenance and system performance. This app helps homeowners save on utility bills and maintain ideal comfort levels.
This application enables remote monitoring and control of your home's HVAC system. Adjust temperature, fan speed, and vane direction, set schedules, and receive alerts from anywhere. It provides convenient control over your home's climate.
Manage your home's heating, cooling, and water heater systems remotely. Optimize energy efficiency, track consumption, and set custom schedules for comfort and savings. Receive alerts for maintenance and system updates.
This tool helps outdoor workers stay safe by providing real-time heat index information and hourly forecasts specific to their location. It offers occupational safety recommendations and details on heat-related illnesses and their first aid.
Manage your electricity account with detailed usage tracking, bill payment, and smart home device integration. Monitor electricity, solar, and EV usage, receive alerts, and adjust your thermostat remotely. Access account essentials and get 24/7 customer support.
This app transforms your smartphone into a thermal imaging device when connected to a compatible camera. It helps identify hidden issues like water damage, electrical faults, and HVAC problems with advanced visual enhancements and measurement tools. Document and share your findings easily.
Remotely monitor and control your home's heating and cooling system from anywhere. Adjust schedules, set temperatures, and receive alerts for your connected thermostats. Offers weather forecasts and multi-location management.
Remotely manage compatible water heaters with this app. Monitor temperature, operating modes, and receive diagnostic notifications. Optimize energy usage by aligning with utility programs.
Control your water heater remotely, monitor hot water levels, and receive maintenance alerts. Optimize heating schedules for convenience, comfort, and safety, while also saving on energy costs.
This comprehensive tool assists propane professionals with essential calculations and field checks. It offers guidance for regulator and pipe sizing, relief valve selection, and detailed field notes. Professionals can conduct various system checks and generate reports directly from the app.
This app provides trade professionals with a mobile platform to shop for plumbing, heating, HVAC, electrical, and industrial supplies. It features powerful search tools, including image and voice search, barcode scanning, and easy account management for placing and tracking orders.
This app provides an instant mobile refrigerant charge calculator for HVACR applications. It supports various refrigerants and allows users to calculate the correct system charge based on superheat, subcooling, or airflow, along with environmental conditions.
Access a vast database of HVAC models, manuals, and part lists to speed up your work. Utilize an AI-powered troubleshooting tool or connect with experienced technicians for real-time support.
This app provides Daikin service contractors with instant access to all technical and service information for Daikin products. It includes product specifications, manuals, error code troubleshooting, interactive field settings, and service videos. The app works online and offline, syncing data automatically for the latest updates.
Instantly calculate HVAC duct sizes based on airflow, friction rate, or velocity. This tool provides accurate duct dimensions in seconds without needing charts, supporting various duct types and units.
This app offers a comprehensive suite of tools for HVAC technicians. It provides interactive guides, step-by-step repair instructions, and calculators for various HVAC calculations including superheat, subcooling, and duct sizing.
This app uses real-time weather data to calculate heat stress risk for outdoor workers. It provides customized alerts for rest, hydration, and changing conditions, along with safety resources.
Easily document floor plans, measurements, photos, and notes on-site. This app allows for cloud-based project access across all devices, ensuring your data is backed up and synchronized. Streamline your workflow and improve efficiency for various trade professionals and DIYers.
This app provides advanced calculation tools and comprehensive data for pipe trade professionals. It streamlines workflows for pipefitters, welders, and steamfitters with features for measurements, fluid dynamics, and material specifications. Designed for efficiency and accuracy, it works offline for on-site use.