Carina vs ONWASA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Carina
Monitor and control your Carina grid-interactive water heater remotely. View tank temperatures, hot water levels, and critical alarms. Track estimated energy usage and activate vacation mode for convenience.
- View tank temperatures
- Monitor hot water remaining
- Track estimated energy usage
- Receive critical alarms
- Activate vacation mode
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Gain insight and control over your Carina grid-interactive water heater. View current tank temperatures and hot water remaining, monitor critical alarms, track energy usage over time*, and remotely put your water heater into vacation mode. * The energy usage and energy costs displayed in this app are estimates. Thermostat icon designed by Hirschwolf from Flaticon.
ONWASA
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This Mobile App is designed to give you fast, secure account access so you can easily manage your account details, view your bill and your account balance, make payments and find payment locations and stay connected via facebook. Nearly everything you can do from our portal can now be handled instantly whether you're at home, at work, or on the go.
Screenshots
Verdict
Carina and ONWASA are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Carina ships an update every 3 months, ONWASA every 4 months. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.
| Parameter | Carina | ONWASA |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (7 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 7 — better | — |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 40 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Carina Technology | Onslow Water and Sewer Authority |
In-app purchases
Carina
No in-app purchases
ONWASA
No in-app purchases
