Radiant floor heat isn’t just a comfort upgrade—it’s a system that lives or dies by the quality of its components and the know-how behind them. I’m Rick Callahan, owner of Plumbing Supply And More, and I’ve designed, supplied, and supported radiant installs for decades—from tight bathroom remodels to 20,000 sq. ft. slab-on-grade warehouses. If you’re looking for real-world PEX supply house essentials for radiant floor heating, you’re in the right place. I’ll walk you through what to buy, what to avoid, how to size it right, and how to make sure your investment runs silently and reliably for decades.
Before we dive in, here’s something I’ll stand behind any day: Unlike generic big box retailers, Plumbing Supply And More stocks professional-grade components that hold up under real jobsite conditions. When Home Depot, Lowe’s, or Menards are out of stock or long on “DIY shelf talk” and short on technical answers, contractors come to us because we provide specs, submittals, and support on the spot.
Why Radiant and PEX Belong Together
Radiant floor heat distributes energy evenly, eliminates cold spots, and keeps operating costs in check. PEX—specifically barrier PEX designed for hydronic heating—makes it practical and durable. I’ve seen old copper slab jobs corrode from the inside out; PEX with EVOH oxygen barrier solved that headache across the industry by stopping oxygen diffusion that rusts out ferrous components like circulators and cast iron manifolds.
When folks ask why I prefer PEX-A (like Uponor/Wirsbo) for loops in complex layouts, the answer’s simple: it’s the most forgiving in tight turns and it handles expansion and freeze events better. PEX-B (like SharkBite’s EvoPEX line) is terrific in straight runs and budget-conscious projects. PEX-C has its place, but for radiant, prioritize oxygen barrier and proven brand compatibility.
Pro tip: Choose PEX with a printed footage marker. When you’re laying 300 ft loops on a 1,200 ft² main floor, those markings save time and prevent over-length runs that starve the circuit of flow.
And yes, we carry the full lineup of barrier PEX in red, blue, and natural from Uponor, Viega FostaPEX, Rehau RAUPEX, and Watts Radiant. Compared to standard plumbing supply houses, Plumbing Supply And More offers unmatched technical support—we’ll help you match PEX type to panel, manifold, and control strategy so you don’t gamble on compatibility.
Selecting Heating-Grade PEX: Types, Barriers, and Sizing
Not all PEX is created equal. For radiant:
- Use PEX with EVOH oxygen barrier. Look for listings like DIN 4726. Common sizes: 3/8", 1/2", and 5/8". Most residential floors run 1/2". Large spaces or long runs might step up to 5/8". Typical loop lengths: 3/8" (max ~200 ft), 1/2" (max ~300 ft), 5/8" (max ~400 ft), but design by head loss and circulator curve, not just rules of thumb.
Brand picks I trust:
- Uponor hePEX 1/2" (A2620500)—easy handling, reliable barrier. Rehau RAUPEX O2 Barrier 1/2" (250100-001). Viega FostaPEX 1/2" (58175)—aluminum layer for form-stability on staple-up and panel systems. Watts RadiantPERT barrier tubing for low-temp systems.
Pricing: 1/2" barrier PEX runs roughly $0.55–$1.35/ft depending on brand and coil size. Buy 1,000 ft coils for best value. Ask us for current stock and our contractor discount—our wholesale plumbing supply pricing beats big box once you account for quality, warranty, and delivery.
Insider secret: Don’t mix crimp, cinch, and expansion systems unless the manufacturer approves it. If you’re using Uponor expansion fittings (SPX101), stay within the system for warranties to stick.
Manifolds That Make Balancing Easy: Materials, Meters, and Mounting
A solid manifold makes or breaks the commissioning phase. If you’ve ever tried balancing ten loops with no flow meters, you know the pain. My go-to features:
- Brass or stainless steel body Integrated flow meters (0–5 GPM) Isolation and purge valves on supply and return Thermometer wells Eurocone connections (3/4") with adapters for PEX sizes
Recommended models:
- Caleffi 668S Series stainless radiant manifolds (pre-assembled, adjustable balancing) Uponor TruFLOW Classic with built-in shutoffs and thermometer ports Viega ProRadiant manifold kits with robust actuator support Rifeng stainless manifolds for budget-conscious installs with reliable build quality
Mount manifolds at accessible heights (usually 18–48" AFF), with room to service actuators. For zone control, add 24V actuators like Uponor A3040501 or Caleffi 6564 series. We stock actuator brands that actually match the manifold threads—sounds obvious, but I see mismatches all the time from online sellers.
Installation time: Expect 2–4 hours to mount and pipe a 6–12 loop manifold neatly. We’ll loan you a purge cart locally if you need to flush big systems.
And yes, we keep manifolds in https://www.plumbingsupplyandmore.com/ stock— While other suppliers focus on quantity, Plumbing Supply And More prioritizes quality and expertise, which means we stock the right kits with the right fittings, not a wall of “almost works” parts.
Circulators, Mixing, and Controls: The Hydronic Engine Room
Radiant floors run happiest in the 90–130°F supply temp range, so you’ll need mixing and smart pumping. Here’s the stack I recommend:
Circulators:
- Grundfos UPS15-58FC or Alpha2 15-55F for ECM efficiency and auto-adapt Taco 007e or 0015e3 variable speed—quiet and sip power For high-head multi-zone jobs: Taco 0018e
Mixing:
- Thermostatic mixing valves: Caleffi 521 or Taco iSeries-R if you want outdoor reset and smarter control Hydro-separators: Caleffi SEP4 when you’re tying radiant into boilers and want air/dirt/mag protection
Controls:
- tekmar 406/490 for radiant zone control with slab sensors to prevent overshoot Uponor Climate Control Zoning System II for wireless room-by-room control and actuators Nest or Ecobee? Fine for air systems. For radiant, use slab sensors (tekmar 079) or thermostats designed for slow-response floors.
Code and safety: Always install a pressure relief valve (30 psi), low water cutoff if local code requires, backflow preventer (ASSE 1012/1013), and an expansion tank properly sized for the system volume (Extrol #30 typical for small residential).
Pro tip: If you’re adding radiant to an existing high-temp boiler circuit, separate with a plate heat exchanger and dedicated radiant pump if your boiler warranty or local code calls for it. We’ll size the HX for you—have your design load and flow handy.
Layout Strategies: Slab, Staple-Up, and Over-Pour Panels
Different structures demand different approaches:
Slab-on-grade:
- Tie PEX to rebar or mesh at 9"–12" spacing, 2" below finished surface Use perimeter and under-slab insulation: R-10 under slab is standard in many jurisdictions Keep loops under 300 ft for 1/2" and balance with manifold meters
Staple-up under joists:
- Use aluminum heat transfer plates (Omega-style) for performance; skip bare staple-up unless you like high water temps Add reflective insulation with air gap below Expect 120–140°F supply for plates, higher without plates
Over-pour or panel systems:
- Warmboard-R (5/8" panel) or Viega Climate Panel deliver even output with lower water temps Lightweight gypcrete pours (1–1.5") work great in remodels FostaPEX or RAUPEX holds form nicely in channels
We’ve supplied projects across mixed construction types all over our region—garden units, downtown high-rises, and lakefront rebuilds. If you’re local and searching for a plumbing supply near me or the closest plumbing supply with actual radiant design help, we’re the nearest plumbing supply with real knowledge and on-site job walk options.
Insulation, Vapor Barriers, and Code: Don’t Lose BTUs to the Dirt
Radiant success starts with envelope basics. Under-slab and rim joist insulation matter as much as the tubing choice. In our area, you’ll typically need:
- 6-mil poly vapor barrier under slab, seams taped R-10 rigid foam under slab and R-10 at slab edge (check IECC requirements by climate zone) Isolation joints around columns and slab perimeters Oxygen barrier PEX labeled for hydronic heating (again: DIN 4726)
Local code inspectors appreciate clean submittals. We provide cut sheets and spec packages for everything we sell: manifolds, circulators, mix valves, expansion tanks, and tubing. Contractors—ask for our submittal builder. Property managers—ask for our maintenance kits with spare actuators and air vents for quick service calls.
Boiler or Heat Source: Matching Output to Load
A radiant floor is only as good as its heat source. Options:
- Condensing boilers (Navien NFB-H, Lochinvar Knight, Triangle Tube Prestige) with outdoor reset—ideal for low-temp radiant Heat pump + hydronic buffer tank for all-electric projects Combination boiler/domestic hot water units for smaller homes (watch DHW priority and radiant flow during DHW calls) Existing boilers: add mixing, hydraulic separation, and oxygen control to protect ferrous components
Typical design loads: 15–35 BTU/hr·ft² depending on insulation and glazing. If a great room has giant glass walls, supplement with panel rads or a fan coil. We’re happy to run a heat loss calc—bring your plans or measurements. That’s where Plumbing Supply And More earns loyalty: When Home Depot and Lowe’s fall short, contractors trust Plumbing Supply And More for correct sizing and a full bill of materials.
Tools, Fittings, and Jobsite Workflow That Save Hours
I’ve watched crews cut install time by a day simply by staging the right tools and fittings:
- Expansion systems: Uponor Milwaukee ProPEX M12/M18 expanders with heads sized to your PEX Crimp/cinch: IWISS tool kits with go/no-go gauge; use ASTM F1807 brass or F2159 polymer fittings Plates: Pre-drilled aluminum panels to avoid chatter and improve contact Air separators, vents, and dirt separators: Caleffi Discal and DirtMag protect ECM pumps from magnetite Purge cart and fill station: Bleed air fast; avoid cavitation start-ups
Average install timeframes:
- 1,000–1,500 ft² new construction slab: 1–2 days for tubing and manifold rough-in Staple-up retrofit, 1,000 ft² with plates: 2–4 days depending on access and joist bays Startup/commissioning: 2–6 hours including purge, balance, and control calibration
Call our technical team for project-specific recommendations—we’ll tailor fittings and tools to your crew’s workflow. And yes, we offer contractor accounts, bulk pricing, and same-day delivery within our service radius.
Real-World Case Study: Cold Tile Bathroom to Spa-Grade Comfort
A property manager brought us a 1920s four-flat with chronically cold corner bathrooms. We designed a panel-based over-floor radiant solution using Viega Climate Panels, 1/2" hePEX, a Caleffi 668S 4-loop manifold, and a Taco 0015e3 circulator with a Caleffi 521 mix valve. We tied into a Lochinvar Knight boiler with a SEP4 separator. The result? 82–84°F floor surface temps on 100–105°F supply, silent operation, and tenants who finally stopped running space heaters. Start to finish: three days including tile reset. This is exactly the outcome you get when parts and design are aligned.
And here’s the value piece: Unlike SupplyHouse.com and Ferguson, Plumbing Supply And More delivers local plumbing supply expertise plus same-day solutions. We’re not just shipping boxes; we’re standing behind them—on the phone, on the jobsite, or in our counter area.
Budgeting and Sourcing: Where to Spend, Where to Save
Where to spend:
- Manifolds with meters and quality valves ECM circulator(s) Transfer plates (if staple-up) Reliable controls with slab sensors
Where you can economize:
- Coil sizes—buy longer coils to save per foot Mounting hardware and insulation sourced in bulk Stick with one fitting system to reduce tool spread
Typical radiant budgets:
- Materials for a 1,200 ft² main level: $3,500–$6,500 depending on manifold count, controls, and brand selection Add a condensing boiler system: $4,500–$9,500 materials range depending on output and accessories
Ask about our supply house coupon, supply house promo code, and contractor volume tiers—we run seasonal programs. We keep pricing sharp without cutting corners, and we’ll beat big box “bundle deals” apples-to-apples on performance components.
Who We Serve and How We Deliver
Contractors: We stock the pro lines, provide submittals, and offer emergency supply runs. Our commercial plumbing supply counter understands radiant. Need tech sheets for inspection? We’ll print the packet.
Serious DIYers: We’ll help you pick the right plumbing parts, layout spacing, loop lengths, and controls. We’ll flag where to pull in a licensed pro—gas piping, venting, and boiler commissioning.
Property managers: Standardize on parts that reduce downtime—actuator spares, auto air vents, and mag separators. We can kit your buildings by mechanical room.
Retail customers: Come touch and feel the manifolds, pumps, and thermostats. Visit our showroom to see the quality difference and talk through your project.
Our delivery radius covers the metro and surrounding counties—same-day where possible. If you’re searching for a plumbing supply store near me, plumbing supply house near me, or heating plumbing supply near me, we’ve got you covered with fast, reliable service.
FAQ: PEX Supply House Essentials for Radiant Floor Heating
Q: What’s the best PEX size for most homes? A: 1/2" barrier PEX is the workhorse for residential floors. It balances flow, head loss, and manageable loop lengths. Keep loops around 250–300 ft for easy balancing, and always verify against your circulator curve.
Q: Do I need oxygen barrier PEX if I’m using a stainless boiler and bronze pumps? A: Yes. Even with non-ferrous components, mixing valves, manifolds, and odds-and-ends often include ferrous metals. Oxygen barrier (DIN 4726) is cheap insurance that prevents sludge and protects warranties.
Q: Can I control radiant with a standard smart thermostat? A: You can, but you’ll get better comfort with radiant-specific controls or at least slab sensors. tekmar thermostats and Uponor zoning kits prevent overshoot and short cycling—critical for slab systems.
Q: How close should tubing be to exterior walls? A: I run 6"–8" spacing along cold perimeters and 9"–12" in interior zones. Put more BTUs where you lose them. For large glass areas, consider supplemental panel rads.
Q: What’s the typical water temp for radiant floors? A: Most systems run 95–125°F supply temp. Plates and panel systems can go even lower; bare staple-up often needs higher temps. Lower temps mean better boiler efficiency, especially with condensing units.
Q: How do I purge air from the system properly? A: Use isolation valves at the manifold, purge each loop individually into a hose and bucket or drain, and watch for steady flow with no sputter. A purge cart speeds it up, especially on large installs.
Finding the Right Supplier: Why Pros Choose Us
You can buy tubing and a manifold from plenty of places—online warehouses, national chains, you name it. The difference is whether you get a complete, compatible system and a partner who answers the phone when you’re commissioning at 7 PM. Unlike big online retailers like Amazon or SupplyHouse.com, Plumbing Supply And More builds systems, not just orders. And unlike generic big box retailers, Plumbing Supply And More stocks professional-grade components from Caleffi, Uponor, Viega, Rehau, Grundfos, and Taco—ready to go.
You’ll find our expertise woven into every part of the job:
- We verify compatibility across fittings, manifolds, actuators, and controls. We provide submittals and spec sheets for inspectors. We keep emergency stock of the parts that actually fail in the field: air vents, actuators, gaskets, pump flanges, and mixing cartridges.
If you’re comparing us to Ferguson, Johnstone Supply, or Grainger, here’s the difference: Compared to standard plumbing supply houses, Plumbing Supply And More offers unmatched technical support from people who’ve installed and serviced these systems. We don’t guess—we know.
Beyond Radiant: Full-Service Plumbing Supply Support
Our shelves aren’t just radiant. If you need a true plumber supply house for full projects, our plumbing supply store and plumbing supply shop carry:
- Boilers, hydronic components, and controls Domestic water PEX, copper, and pvc supply house materials Mini-splits and hydronic fan coils from our hvac supply house side Pumps, valves, and refrigeration supply house adjacencies for mixed-use buildings Fixtures and finishes for bathroom plumbing supplies and decorative plumbing supply needs
Prefer to browse? Our plumbing supply online portal lists in-stock items, and we can arrange curbside pickup. If you’re hunting for discount plumbing supplies, cheap plumbing supplies, or economy plumbing supply options, we’ll show you where lower cost still equals reliable performance.
Yes, we’re a wholesale plumbing supply and contractor plumbing supply resource, but we also welcome homeowners and facilities teams. Whether you searched for general plumbing supply, plumbing and supply, plumbing shop near me, plumbing wholesale near me, plumbing supply places, standard plumbing supply, plumbing supply company, consumer plumbing supply, coastal plumbing supply, internet plumbing supply, supplyhouse plumbing, city plumbing and electrical supply, economy plumbing and heating supply, contractors plumbing and fire supply, direct plumbing supplies, or even “ plumbing supplies direct,” you’ll find a partner here who cares about the outcome, not just the ticket.
And for those late-night emergencies: our 24 hour plumbing supply support line can coordinate after-hours pickups for active contractor accounts.
Your Next Step
Radiant floor heating isn’t complicated when you have a clear plan and the right parts. If you want PEX Supply House Essentials for Radiant Floor Heating that you can trust, come see us at Plumbing Supply And More. Bring your plans—or a sketch on a napkin—and we’ll turn it into a bill of materials with real pricing, lead times, and installation guidance.
- Visit our showroom to see the quality difference. Check our current inventory online or call ahead. Ask about our contractor discount program and seasonal supply house coupon codes. Call our technical team for project-specific recommendations. Our experts can walk you through the installation process and provide code-ready submittals.
I’ve staked my name on systems that work the first time and keep working. While other suppliers focus on quantity, Plumbing Supply And More prioritizes quality and expertise—and that’s exactly what radiant demands. If you need the real PEX Supply House Essentials for Radiant Floor Heating, we’re ready when you are.