Long wait time for hot water in master bathroom, unclear if existing recirculation plumbing is correct for two-tank series setup.

No clear guidance or resource to verify correct recirculation line placement for two series tanks; homeowner is uncertain and considering costly replumbing during replacement.

Opp. Score

Severity

3Medium

Willingness to Pay

implied

Added

May 21, 2026

App Concept

PlumbCheck Recirculation Advisor

A mobile app that helps homeowners and plumbers design and verify correct hot water recirculation plumbing configurations for multi-tank systems. Users input their tank setup (number, series/parallel, pipe runs) and get a diagram and checklist ensuring code-compliant, efficient routing.

Key Features

Interactive plumbing diagram builder for up to 4 tanks
Step-by-step installation checklist based on input configuration
Automatic detection of common mistakes (e.g., return line placed between tanks instead of before first tank)
Integration with local plumbing code databases

Target Users: Homeowners and plumbers in residential settings with multiple water heaters, particularly those retrofitting or replacing aging systems.

Revenue Model: Freemium with $4.99 one-time fee per diagram; pro subscription $9.99/month for unlimited diagrams and code updates.

Part of App Idea

Long wait time for hot water in master bathroom, unclear if existing recirculation plumbing is correct for two-tank series setup.

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