# Navisizer

> Productivity

Canonical page: [https://chrome-stats.com/d/id1327385997](https://chrome-stats.com/d/id1327385997)

## Overview

- **ID:** `id1327385997`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Navien
- **Category:** Productivity
- **Rating:** 2.40 / 5 (26 ratings)
- **Version:** 3
- **Last updated:** 2024-04-29
- **First published:** 2017-12-26
- **Size:** 21 MB
- **Data as of:** 2026-09-07
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/navisizer/id1327385997)
- **Website:** [https://www.navieninc.com/](https://www.navieninc.com/)
- **Privacy policy:** [https://www.navieninc.com/privacy](https://www.navieninc.com/privacy)

## Description

NaviSizer is designed to assist with sizing of domestic hot water heating systems with Navien NPE Series tankless water heaters. 

For residential applications, NaviSizer offers system sizing, calculation of operating cost and savings, and provides a comprehensive output to be used as a job spec. 

For commercial applications, NaviSizer uses ASHREA Hunter Curve calculations to size a broad range of applications. Both tankless and tankless with storage solutions are offered along with a comprehensive system spec that can be saved, printed, or emailed.

## Rankings

- #290,682 — Overall

## Review summary

Navisizer is praised for sizing accuracy using real conditions and the Hunter curve and for being simple to use, with applicability to residential and commercial projects. However, multiple reviews complain about registration hurdles, blocking forms, and CAPTCHA issues; privacy concerns about collecting or sharing potential client information; several UI/UX bugs that prevent data entry; and a perception that the tool does not reliably size or influence recommendations. Overall, the app shows potential but is hindered by usability, privacy, and reliability issues.

### Pros

- Accurate sizing using real conditions and the Hunter curve for tankless units.
- Simple, accurate, and easy to use.
- Applicable to both residential and commercial projects.

### Cons

- Registration and form validation issues that block access (required fields blocking registration, CAPTCHA-related input problems).
- Privacy concerns about collecting or sharing potential client information to use/access the sizer.
- UI/UX bugs and data-entry problems (fields not accepting input, keyboard closing unexpectedly, generally buggy UI).
- Not helpful for sizing or producing reliable recommendations (perceived as not sizing anything or being pointless).

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- [Navien Heat Pump](https://chrome-stats.com/d/id6741747929)
- [telliSize](https://chrome-stats.com/d/id1178730332) — 5.00 / 5
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Source: [Chrome-Stats](https://chrome-stats.com/d/id1327385997)