Homeowner needs to add a second rainfall shower without losing water pressure or hot water supply, while keeping existing combi boiler.

Existing combi boiler lacks capacity for two simultaneous showers; user doesn't understand how to integrate a cylinder or whether to replace the boiler.

Opp. Score

Severity

3Medium

Willingness to Pay

implied

Added

May 24, 2026

App Concept

ShowerFlow Planner

A web-based tool that lets homeowners input their current boiler model and desired shower configurations, then recommends the optimal upgrade path (e.g., adding a thermal store, unvented cylinder, or system boiler). It provides pressure/flow calculations, component compatibility, and installer referrals.

Key Features

Boiler compatibility database with flow rate and pressure specs
Visual diagram of system upgrade options with cost estimates
Pressure/flow simulation for multi-shower + simultaneous tap use
Installer directory with reviews and certification filters

Target Users: UK homeowners planning bathroom renovations with combi boiler systems

Revenue Model: Free basic flow analysis; £15 per full system report; affiliate commission on installer bookings

Existing Solutions Mentioned

combi boilerrainfall showerelectric showercylinder / unvented cylinder

Part of App Idea

Homeowner needs to add a second rainfall shower without losing water pressure or hot water supply, while keeping existing combi boiler.

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