Hot tub pump struggles and cavitates when diverted through a solar heat exchanger due to increased pipe length, diameter reduction, and multiple right-angle turns.

The existing circulation pump is not designed to handle the additional friction loss from the heat exchanger loop, and there's no easy way to integrate supplemental solar heating without drilling new holes or adding a secondary pump.

Severity

3Medium

Willingness to Pay

implied

Added

Jun 24, 2026

Workarounds Described

Manual calculation of pipe friction losses
Using a motorized T valve to divert flow
Adding a booster pump manually

Implied Software Gaps

Automated flow and load monitoring to prevent pump cavitation
Smart pump sequencing when diverting to heat exchanger

App Concept

SolarSync Pump Booster

A smart auxiliary pump controller that automatically activates a booster pump when a diverter valve engages the solar heat exchanger loop. It monitors flow rate and pump load to ensure the circulation pump never cavitates, while optimizing energy savings. Works with existing hot tubs and solar thermal systems.

Key Features

Flow rate sensor to detect cavitation risk
Relay output to trigger a secondary pump
Adjustable delay and hysteresis settings
Wireless integration with smart home systems

Target Users: Hot tub owners and installers (DIYers and pros) who want to retrofit solar water heating to existing tubs without major plumbing modifications.

Revenue Model: Freemium with $49/mo pro tier

Existing Solutions Mentioned

motorized T valvespreadsheet (implied for design to share photo)copper heat exchanger from boiler furnace

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