Homeowner needs to repurpose an existing gravity recirculation line for a new tankless water heater but cannot access the tee connection under the floor.

No clear guidance on retrofitting a gravity recirc line for tankless without access to the tee; standard recirc pump solutions require additional components and may have performance trade-offs.

Severity

3Medium

Willingness to Pay

implied

Added

Jun 21, 2026

Workarounds Described

plumbing return line into cold water feed via pump in utility room

Implied Software Gaps

Tool to model existing plumbing and recommend optimal recirculation line conversion without accessing hidden tees

App Concept

RecircPlumb Wizard

An AI-powered diagnostic and design tool that helps homeowners and plumbers retro-fit recirculation lines for tankless water heaters. It analyzes existing plumbing layout constraints (e.g., inaccessible tees, cistern systems) and recommends optimal pump placement and components, with 3D diagrams and step-by-step instructions.

Key Features

Input existing plumbing constraints (gravity line, inaccessible tee, cistern/well)
Generate retrofit design with pump placement recommendations
Provide interactive 3D diagram of recommended configuration
List compatible recirc pumps and parts with links to purchase

Target Users: Homeowners and DIY plumbers converting from tanked to tankless water heaters with existing recirculation lines, especially in rural areas with cisterns or wells.

Revenue Model: Freemium: basic diagnostic free, full design and parts list $19.99 per use; or $9.99/month subscription for unlimited designs.

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