A plumber has a 12-year-old Rinnai tankless water heater with severely reduced hot water flow despite multiple flushing attempts, and needs a solution to either restore flow or decide on replacement.

Standard flushing chemicals and manual valve cleaning are insufficient to remove hardened mineral scale from a neglected heat exchanger, and Rinnai support recommends replacement without offering a stronger descaling method.

Severity

4High

Willingness to Pay

implied

Added

May 8, 2026

Workarounds Described

flushed multiple times with off-the-shelf Home Depot descaler
removed and cleaned all valves manually

App Concept

ScaleBurst Pro

ScaleBurst Pro is a professional-grade, high-concentration descaling solution and pump system designed for stubborn mineral buildup in tankless water heaters. It combines a powerful citric acid-based formula with a recirculation pump that pulses flow to dislodge scale, restoring full water flow without requiring heat exchanger replacement.

Key Features

Professional-strength descaling chemical safe for heat exchangers
Recirculation pump with pulse mode for deep cleaning
Compatible with all major tankless brands
Integrated flushing kit with pressure gauge to measure flow improvement

Target Users: Plumbers and HVAC technicians servicing residential tankless water heaters with low flow due to scale buildup

Revenue Model: $79 per kit (chemical + pump rental), $29 for chemical refill

Existing Solutions Mentioned

flushing with off-the-shelf Home Depot descaler

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