
Product Information
Transform your shower into a luxurious spa with the ThermaSol PROIII-140 PRO Series II Ultimate Steam
Shower Generator.
Designed for steam rooms up to 140 adjusted cubic feet, this powerful 8kW generator delivers consistent
and reliable steam output for unparalleled relaxation.
Featuring FastStart technology for rapid heat-up, Smart Steam for precise temperature regulation, and
the PowerFlush system to prevent sediment buildup, it ensures exceptional performance and long-lasting
durability for a premium home spa experience.



Product Features
The ThermaSol PROIII-140 provides a consistent, uninterrupted steam flow with patented Smart Steam technology.
Exclusive FastStart technology generates steam in seconds, while PowerFlush ensures optimal tank performance by efficiently removing sediment buildup.
Equipped with two-way CAN-bus technology, it integrates seamlessly with HydroVive, Serenity systems, and other accessories.

ThermaSol PROIII-140 PRO Series II Ultimate Steam Shower Generator
Quick Steam Activation with FastStart Technology:
Experience steam in seconds with FastStart technology, delivering rapid and efficient steam production
for ultimate relaxation.
Consistent and Smooth Steam Performance:
The PROIII-140 ensures continuous, burst-free steam flow, creating a calming and spa-like environment in
your steam shower.
Sturdy Construction for Long-Term Reliability:
Built with corrosion-resistant stainless steel and premium low-watt density Incoloy heating elements,
this generator guarantees exceptional durability and performance.
Advanced Connectivity for Personalized Control:
Equipped with two-way CAN-bus technology and Smart Steam temperature control, the PROIII-140 integrates
seamlessly with compatible controls and accessories for a customized steam shower experience.
Additional Features
Discover exceptional performance and innovative technology with the ThermaSol PROIII-140 PRO Series II Ultimate Steam Shower Generator. Designed for reliability, ease of use, and ultimate relaxation, it blends advanced features with robust construction to elevate your steam shower into a luxurious spa-like escape.

Rapid Steam Generation
FastStart technology provides steam in seconds, allowing you to enjoy instant relaxation without delay.

Energy Efficiency
Designed with low-watt Incoloy heating elements, the system maximizes energy efficiency while maintaining exceptional performance and reliability.

Enhanced Digital Connectivity
Two-way CAN-bus technology ensures seamless integration between the generator and controls, offering smooth and intuitive operation.

Durable Stainless Steel Build
Constructed with premium stainless steel and low watt-density Incoloy heating elements for exceptional reliability and efficiency.
What’s Included?
- 8kW Steam Generator
- Stainless Steel Drain Pan
- 3/8" Braided Stainless Steel Hose & Fitting
- In-line Water Screen Kit
- Pre-plumbed Safety Relief Valve
- Steamhead Housing and Cable Kit
- 208-240 Volt Power Cord (5ft)
- 50' CAN-bus Cable for the Controller
- Installation Instructions
- Static Cling Warning Label
- Warranty

About ThermaSol
ThermaSol, a US-based pioneer in residential steam showers, has been innovating spa equipment since 1958.
Established by David Altman, the company has been proudly family-operated for three generations and became part of the Harvia family in 2024.
Offering smart showers, steam and sauna systems, and advanced steamheads, ThermaSol is committed to delivering safe, reliable, and eco-friendly multi-sensory spa experiences.


Why Choose Us?
Choose Peak Primal Wellness for a personalized, community-driven approach to health. We prioritize your well-being with high-quality products, tailored solutions, and 24/7 support.
As a family-owned business, we build lasting relationships, offering authentic, effective solutions to help you achieve your wellness goals.
Join our thriving community and embark on a journey toward optimal health with passionate professionals who genuinely care. At Peak Primal Wellness, you're not just a customer—you're family.
Specifications
Model | PROIII-140 |
Kilowatt Rating | 8 kW |
Maximum Cubic Feet | 140 ACF |
Amperage | 37 |
Heater Weight | 44 lbs |
Water Inlet | 3/8" Compression |
Steam Outlet | 1/2" NPT |
Drain Pan | 3/4" NPT |
Safety Valve | Pre-Plumbed |
Electrical Connection | NEMA 6-50P |
Width | 18" |
Depth | 23" |
Height | 14" |
Warranty & Returns
Return Policy
To request a return or refund, customers can use our contact form, email info@peakprimalwellness.com, or phone – (877) 689-4898 . Once the product is inspected and confirmed to be in brand new condition, we will initiate the refund, which typically takes 5–7 business days to post back to the original payment method. Refunds can be applied via the customer’s preferred method, including card or bank transfer. Shipping instructions and the return address will be provided upon contacting customer service. Please include photos if the product arrives damaged. Click here to view our complete return policy for more details.
Shipping Policy
Customers may contact us by phone or email anytime to inquire about the status of their order. While we may not always have a tracking link available before the order ships, we are happy to check its current status for you. If an item is never received, please contact us immediately. We will promptly file a claim on your behalf and ship a replacement to ensure you receive your product as soon as possible. Click here to view our complete Shipping policy for more details.
Frequently Asked Questions
How does FastStart technology enhance the steam experience?

FastStart technology allows the PROIII-140 to produce steam in seconds, ensuring a quick and efficient start to your steam shower experience.
Is the PROIII-140 simple to install?

Yes, the PROIII-140 is designed for easy installation and can be positioned up to 50 feet away from the steam shower, providing flexibility in placement.
What are the advantages of the split tank design?

The split tank design separates the water feed and heating functions, reducing wear and increasing the generator’s lifespan for dependable performance.
Which control systems are compatible with the PROIII-140?

The PROIII-140 integrates seamlessly with ThermaSol control systems like Thermatouch, Signatouch, Microtouch, Signature Control, and Easy Start, offering full customization.
Does the PROIII-140 work with additional ThermaSol accessories?

Yes, the PROIII-140 is fully compatible with HydroVive, Serenity systems, and other ThermaSol accessories to enhance and personalize your steam shower experience.