Earth Thermal Storage (Radiant Floor Heating in Concrete Slabs)
High-Performance Comfort, Hidden Beneath the Slab
Petra’s under-slab radiant floor heating system uses Earth Thermal Storage to efficiently warm slab-on-grade homes, commercial buildings, and institutional spaces. Electric panels embedded in the concrete create thermal mass that stores heat, providing steady warmth even during off-peak hours or temporary power outages.
Why Choose Under-Slab Radiant Heating?
Store Heat and Save Energy
Preheat during off-peak hours and let the slab’s thermal mass radiate warmth long after the system cycles off.
Install Quickly and Affordably
Buried in the ground before the concrete is poured, this system simplifies installation while cutting down on time, labor, and traditional radiant complexity.
Enjoy Silent, Safe Comfort
No moving air, no flames, and zero maintenance—just clean, even heat every day.
Stay Warm During Outages
In the event of power loss, the slab holds heat for hours or days—ideal for remote builds and warehouses storing sensitive goods.
Ideal for Slab-Based Construction
Primarily built for large buildings, this system also works for homes—and may qualify for HydroQuebec incentives or flexible rates that reduce upfront and long-term energy costs.
Key Benefits for Building Owners and Operators
- Delivers consistent, even heat from the ground up
- Virtually fireproof—heating panels are embedded 7–12 inches below the concrete
- Cleaner and safer than forced-air or combustion-based systems
- Eliminates condensation and cold-floor issues
- No ducts, filters, or moving parts to maintain
- Compatible with solar and off-grid energy setups
Energy Savings Through Smart Design
Petra’s Earth Thermal Storage system is built for cost-efficiency. By heating concrete slabs during lower electricity rate periods, it reduces utility costs while maintaining consistent warmth. Ideal for building owners and operators in Ontario and Quebec looking for long-term savings and sustainable performance.
Technical Data Sheets
Let’s Talk About Your Project
From early planning to last-mile details, our experts are here to help you build smarter. Let’s find the right solution for your home or commercial project.
FAQs
Got questions? We’ve answered the most common ones below. If you need specs, pricing, or technical support tailored to your project, reach out to us and we’ll get you the details you need.
How is radiant floor heating installed in concrete slabs?
Panels are laid on compacted soil or sand, then buried with 7 to 12 inches of sand before the concrete is poured. This layered installation enhances thermal storage and protects the system.
Is this system electric or hydronic?
Our Earth Thermal Storage system is electric, offering simpler installation, easier zoning and controls, and zero maintenance compared to hydronic systems.
How long does the slab stay warm?
Depending on insulation and load, slabs can retain heat for 12 to 48 hours without additional energy use.
Can I combine this with other radiant systems?
Yes. It integrates well with radiant ceiling panels and snow melting systems, making it suitable for residential, commercial, and institutional projects.
Is radiant heat in concrete more efficient than forced air?
In most cases, yes. It eliminates duct losses, keeps warmth where it’s needed—on the floor—and takes advantage of lower off-peak electricity rates offered by utility providers.