Scale and sediment buildup is the leading cause of steam generator failure — and the most common maintenance conversation you will have with clients after a steam shower installation. ThermaSol addresses this at the product level with PowerFlush, a built-in pressurized inner tank cleaning system exclusive to ThermaSol PRO Series generators. No other residential steam generator brand includes an automated cleaning system built directly into the unit. This guide covers how PowerFlush works, when to run it, and how to activate it on every current ThermaSol control — so you can brief every client at handoff and reduce post-installation support calls.
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Why scale matters in steam generators
Every steam generator heats water to produce steam — and wherever water is heated, dissolved minerals separate and deposit as scale. Calcium and sediment accumulate inside the generator tank over time, coating heating elements, restricting water flow, and forcing the unit to work harder. Reduced efficiency, inconsistent steam output, premature wear, and ultimately generator failure are the results of unaddressed scale buildup.
In hard water areas this accelerates significantly — a generator in a high-mineral-content water area can develop serious scale problems within months without a regular cleaning program in place. Most competing steam generator brands require periodic external manual descaling to address this. ThermaSol solves it from the inside out.
PowerFlush is exclusive to ThermaSol. No other residential steam generator brand offers a built-in automated inner tank cleaning system. Competing generators require external manual descaling — a process that takes more time, requires chemicals, and depends entirely on the homeowner remembering to do it. PowerFlush is built in and prompted automatically by the generator at every 1,000-minute usage interval.
How PowerFlush works
PowerFlush uses household water line pressure and specially designed speed slots inside the inner tank to boost water pressure within the generator. As the pressurized water moves through the tank interior, it sweeps calcium deposits and sediment out of the system and into the drain — without any chemicals, external pump connections, or manual intervention from the homeowner.
A full PowerFlush cycle runs for 45 minutes in two phases:
Phase 1 — flush (first 7 minutes). Water flows from the steamhead into the shower drain, carrying calcium and sediment out of the generator tank. Brief your client at handoff that water draining from the steamhead during PowerFlush is normal — it is the system working as designed, not a malfunction. The shower enclosure door must be closed and no one should be inside during this phase.
Phase 2 — steam session (remaining ~38 minutes). Once the flush phase is complete, the generator automatically switches to a normal steam session for the remainder of the 45-minute cycle. The generator returns to standby automatically when complete.
Safety — brief every client at handoff. No one should be inside the shower enclosure during the PowerFlush cycle. The enclosure door must be closed before starting and must remain closed until the cycle is complete. This is in the ThermaSol manual and should be part of every installation handoff conversation.
When to run PowerFlush
ThermaSol recommends running PowerFlush at least once a month and at a minimum after every 1,000 minutes (16.66 hours) of usage. The generator tracks usage automatically and will prompt a PowerFlush when the threshold is reached — three warning sessions occur before the lockout, giving the homeowner notice before the unit requires a cycle to resume normal operation.
In hard water areas, recommend running PowerFlush every two weeks rather than monthly. The harder the water and the more frequent the steam sessions, the faster calcium accumulates between cycles.
Manual descaling every few years. PowerFlush handles routine maintenance automatically — but ThermaSol also recommends a manual descaling by a licensed plumber or authorized technician every few years to eliminate deep mineral deposits that may accumulate over time. Regular monthly PowerFlush cycles reduce how frequently this is needed but do not eliminate the need entirely on hard water installations. This is a service call worth noting at handoff.
How to activate PowerFlush on each ThermaSol control
ThermaTouch2 and SignaTouch
Go to Settings on the control. Select Start Power Flush from the menu and confirm. The cycle begins automatically.
MicroTouch and OneTouch
Press the — and + signs simultaneously and hold for 5 seconds. The array LEDs will flash in a clockwise direction to confirm the cycle has started.
TempTouch
Hold the up and down arrows simultaneously for 10 seconds. The status bar will go from right to left and light up Music, Steam, and Light icons to confirm the cycle has started.
Signature Series and Elite
Hold up and down arrows simultaneously for 5 seconds to enter Settings. Scroll to Power Flush, press Select, choose YES with up or down arrow, then confirm with Select.
For any control not listed here, refer to the ThermaSol Support Center for step-by-step instructions by control model.
What PowerFlush protects
Incoloy heating elements. ThermaSol PRO Series III generators use Incoloy heating elements for superior corrosion and scale resistance. PowerFlush keeps scale from accumulating on these elements, maintaining heat transfer efficiency and extending element life.
Split tank design. The PRO Series III exclusive split tank design separates the heating function from the water feed function. PowerFlush flushes the water feed section while the heating section maintains integrity — a design advantage competing generators without split tanks cannot replicate.
CAN BUS digital communication. The PRO Series III uses exclusive CAN BUS technology for reliable digital communication between the generator and controls. Keeping the generator clean protects this system and ensures consistent Smart Steam performance.
Smart Steam sensors. Scale on sensors causes inaccurate temperature readings and inconsistent output. PowerFlush keeps sensors clean so ThermaSol's patented Smart Steam technology delivers steam at a constant rate without spikes or fluctuations.
ThermaSol PRO Series III — full exclusive feature set
PowerFlush is one of several exclusive ThermaSol features that together make the PRO Series III the strongest steam generator specification available:
- Smart Steam (patented) — constant steam at a constant rate, no temperature fluctuations or vapor bursts
- FastStart (exclusive) — steam in seconds, not minutes
- PowerFlush (exclusive) — built-in pressurized inner tank cleaning system
- Split Tank Technology (exclusive) — separates heating and water feed functions
- CAN BUS Technology (exclusive) — digital communication for seamless control integration
- Incoloy heating elements — superior corrosion and scale resistance
- Stainless steel drain pan included — simplifies installation and maintenance
- Lifetime Warranty (exclusive) — the strongest warranty in the steam generator industry
The PRO Series III can be installed up to 50 feet from the shower in a finished, climate-controlled space with at least 6 inches of clearance on all sides. The unit must remain accessible at all times — do not enclose behind walls or inside a bench. Requires 208–240V single-phase power supply with a dedicated breaker. Dimensions: 13 15/16" W × 18 11/16" D × 11 15/16" H.
Shop ThermaSol PRO Series III at PlumbersCrib.com
- ThermaSol PRO Series III steam generators — all sizes from 84 to 1,200 cubic feet, PowerFlush included on every unit
- ThermaSol controls — ThermaTouch2, SignaTouch, MicroTouch
Contact our team or call 877-881-5501 Monday through Friday for help selecting the right PRO Series III generator for your project.