When you’re installing tankless, the accessories make or break the system. I’ve been sizing, stocking, and troubleshooting water heaters for three decades, and I can tell you—cheap valves, undersized gas lines, or the wrong vent kit will turn a premium unit into a callback machine. At Plumbing Supply And More, we’ve built our reputation by getting the details right. If you’ve ever searched “ plumbing supply near me” hoping for someone who actually knows their stuff, you’ve found the right shop.
Unlike generic big box retailers, Plumbing Supply And More stocks professional-grade components for tankless systems—because that’s what holds up in the field. We carry premium brands (Navien, Noritz, Rinnai, Takagi, Bradford White Infiniti) and the accessories that keep them running efficiently for years. Whether you’re a contractor juggling tight timelines, a serious DIY homeowner, or managing a portfolio of rentals, this guide will walk you through the tankless accessories that matter—what to buy, why it matters, and how we support you before and after the sale.
Why Accessories Decide the Lifetime Performance of Your Tankless
Tankless water heaters are unforgiving about three things: water quality, fuel delivery, and venting. Miss on any of those, and you’ll be dealing with scale lockouts, combustion errors, or nuisance shutdowns. I’ve seen beautifully mounted units fail because someone used a combo gas flex in place of a properly sized hard line or skipped the isolation valve kit. Don’t make that mistake.
Here’s the reality: a tankless heater isn’t just the box on the wall—it’s an integrated system. That’s why our plumbing supply store team pulls the full bill of materials for your job: isolation valves, condensate neutralizer, vent terminations, backflow protection, expansion tank (when required by code), proper wire gauge for recirc pumps, and a flushing service setup. We’ll even print the spec sheets and local code references, so your inspection passes first time.
And when the competition sells a tankless without the neutralizer or uses thin-wall vent that isn’t UL‑1738 listed? You inherit the problem. Compared to standard plumbing supply houses, Plumbing Supply And More offers unmatched technical support—we walk your crew through vent limits, gas sizing, and recirculation options, step-by-step.
Essential Isolation Valve Kits: The One Accessory You Never Skip
Every gas tankless should get an isolation valve kit with purge ports. Period. It’s not just for future service—it changes daily performance by keeping the heat exchanger clean.
What I recommend:
- Webstone 3/4" or 1" Lead-Free Pro-Pal Isolation Valve Kit with PRV ports (models 46412W for 3/4", 46612W for 1"). Brass, quarter-turn reliability, color-coded handles. Rinnai Service Valve Kit 104000045 for RUR/RUS models—clean integration and reduced leak points. Noritz IK-WV-200-1-TH-LF for models like NRC661/NRCP1112.
Pro tip: If you’re in hard-water zip codes or using a well, use isolation valves that accept standard garden hose connections and keep a dedicated pump/descaler kit on hand. We stock RectorSeal Calci-Free and J.C. Whitlam Flow-Aide. Expect a descaling every 12–18 months in 15–20 gpg water. Average kit pricing: $95–$195; flushing pump kits run $120–$225. A clean exchanger means proper delta‑T, quieter operation, and higher efficiency—not to mention far fewer error codes like 11, 12, or E003.
While other suppliers focus on quantity, Plumbing Supply And More prioritizes quality and expertise—we specify kits that match your unit’s union size and local code, and we’ll set you up with the right descaler concentration and service interval for your area.
Water Quality: Filters, Softeners, and Scale Inhibitors That Actually Work
Scale is the silent killer of tankless. If you’re installing in areas with 10+ gpg hardness, protect the unit. Options we trust:
- Scale inhibitors: Aqua-Pure/AP430SS (stainless housing) for light–moderate hardness; easy maintenance and won’t create a slippery feel like softeners. Full softeners: 32k–48k grain ion-exchange systems when hardness is 15–25 gpg; prevents coil fouling and keeps fixtures clean. We stock Clack/Canature valve builds for dependable regeneration. Filtration: 5 micron sediment filters upstream to keep debris out of the inlet screen. We like Pentair Big Blue housings with pressure relief. Neutral pH: If your well runs acidic (pH < 6.5), we’ll spec a calcite filter to prevent copper leaching and pinhole leaks on your return and recirc lines.
Budget: $85–$160 for simple scale cartridges; $900–$1,800 for a whole-home softener plus install. Installation timeframes: 1–2 hours for inhibitor, 3–5 hours for softeners with proper drain and bypass. Want the honest assessment for your job? Call our technical team—we’ll match the solution to your water report and heater model.
When folks search for a plumbing supply store near me or general plumbing supply that understands water chemistry, this is where our experience pays off. When Home Depot and Lowe’s fall short, contractors trust Plumbing Supply And More to spec water treatment that prevents warranty headaches.
Venting and Air Intake: UL-1738, Condensing vs. Non-Condensing, and Terminations
Venting is where I see the most DIY missteps. Condensing units (Navien NPE‑A2/NPE‑S2, Rinnai RU series, Noritz EZ series) typically use 2" or 3" PVC, CPVC, or polypropylene venting; non‑condensing units require Category III stainless UL‑1738 vent.
What we stock and recommend:
- Polypropylene systems: Centrotherm InnoFlue (single-wall or flex) for condensing units—light, airtight, and rated for flue gas temps; less brittle than PVC in cold climates. Stainless Cat III: Z‑Flex or Noritz SS vent for non‑condensing models like older NR98 series—gas tight, corrosion resistant. Termination kits: Proper horizontal rain caps and bird screens; concentric kits reduce wall penetrations and look cleaner on multi-family exteriors.
Vent run limits matter. For example, Rinnai RU199iN supports 2" up to 65 ft equivalent (count elbows!), 3" up to 150 ft. We’ll confirm your equivalent length and advise on 45s vs 90s. Code note: In many jurisdictions we serve, inspectors want primer-visible solvent welds on PVC vent and listed materials per manufacturer instructions. We keep UL‑marked pipe so your inspection isn’t a gamble.
If you’re comparing an hvac supply house or refrigeration supply house for vent parts, be careful—HVAC PVC isn’t always listed for combustion venting. Unlike “the supply house” approach where anything “close enough” gets sold, Plumbing Supply And More verifies UL listings and manufacturer approvals so you don’t inherit liability.
Gas Line Sizing, Regulators, and Leak Protection: Don’t Choke the Burner
An RU199 or NPE-240 uses up to 199k BTU/hr at full fire. On natural gas, that’s no joke for undersized piping. We regularly fix installs where 1/2" black iron starved the appliance and triggered flame failure codes.
What to use:
- 3/4"–1" black iron or CSST sized per IFGC/UPC tables, considering total BTU load and longest run method. Dedicated 2 psi systems with appliance regulators when retrofitting into load-heavy homes with ranges, dryers, and fireplaces. Ball valves rated for gas and proper drip legs. Don’t skip a sediment trap—most manuals require it.
We stock Maxitrol regulators, Dormont appliance connectors (when allowed by code), and full black iron fittings that thread cleanly. Installation timelines: 2–4 hours for straightforward replacements; full re-pipe can be a day or more. Cost ranges: $150–$600 for materials on a typical single-appliance gas upgrade. Need help calculating pressure drop? Our tech counter will run it with you—bring lengths and fittings count.
Compared to Ferguson, Ace Hardware, and SupplyHouse.com, Plumbing Supply And More gives you real-world gas sizing support at the counter—with printed calcs you can hand your inspector. That’s the difference between a pass and a callback.
Condensate Management and Neutralizers: Protect the Drain and Pass Inspection
Condensing units produce acidic condensate—often pH 3–4. You don’t send that into copper or cast iron drains unprotected. Some cities we serve require neutralizers by code; others strongly recommend them.
What works:
- Neutra-Safe NS1/NS2 in-line neutralizers with media kits—compact, transparent housings make it easy to verify media condition. Pump options: Little Giant VCMA-20ULS for longer lifts; we pair with vinyl tubing and a check valve. For cold climates, heat-traced exterior runs prevent winter freezes. Slope matters: Maintain 1/4" per foot on gravity runs and avoid long flat sections.
Plan for media replacement every 12–18 months depending on runtime. We’ll help you size media capacity to your fixture count and recirculation usage. If you’ve been burned by a plumbing supply house handing you a “universal” neutralizer, come see the difference— Plumbing Supply And More specifies neutralizers sized to BTU and duty cycle, not just a one-size tube.
Recirculation: Comfort, Efficiency, and the Right Pump Controls
If your client wants instant hot water at distant fixtures, recirc is a win—but only if it’s designed right. Options vary:
- Built-in recirc (Rinnai RUR, Navien NPE‑A2): Use the internal pump with a dedicated return line or thermal bypass at the far fixture. Control via schedule, aquastat, motion sensor, or smart app. We stock the Rinnai Thermal Bypass Valve (part 804000074) for systems without a dedicated return. External pumps: Grundfos Comfort PM or Taco 006e3 with crossover valves. Simpler retrofit; slightly more heat loss if uninsulated.
Pro tip: Insulate the recirc line (at least 1/2" wall). It reduces standby loss and short-cycles. Expect $150–$450 for pump accessories on top of the heater; 2–6 hours install time depending on return line access. Our crew can help you choose ECM pumps that cut electric draw while maintaining comfort.
Searching for plumbing and supply that understands recirc control logic? Compared to standard plumbing supply houses, Plumbing Supply And More offers unmatched technical support—we’ll help you program timers and set return temps to meet local scald codes.
Electrical, Clearances, and Control Wiring: Small Details, Big Payoffs
Even gas units need proper electrical. Plan a dedicated 120V, 15A circuit with GFCI where required. Follow minimum clearances (often 12" sides, 12" front for service, check your model). For condensing units, verify condensate pump amperage if sharing a circuit.
Accessories we recommend:
- Surge protection: Intermatic IG1240RC3 or equivalent; I’ve seen power spikes scramble control boards. Freeze protection kits for exterior installs (Rinnai Pipe Cover/FK kit, Navien pipe heat trace). Thermostat wire (18/2 or 18/3) for recirc controls and remote temperature controllers. Low NOx compliance labels and documentation in SCAQMD regions and other low-emissions zones we serve.
This is where a city plumbing and electrical supply crossover matters. Because we’re a true plumbing supply company with electrical know-how, we keep the right gauge wire, condensate pumps, and control accessories in stock—no second trips.
Brand-Ready Kits: What We Pair With Each Popular Tankless Model
Here’s how we build dependable packages that pass inspection and keep service calls down:
- Navien NPE‑240A2 (199k BTU, condensing, internal recirc): Webstone 1" service valve kit, Centrotherm 2" PP vent kit up to 60' EL, Neutra-Safe NS2 neutralizer, 3/4" gas with 2 psi option and Maxitrol regulator if needed, Aqua-Pure scale inhibitor in moderate hardness, R‑1 return line insulation. Rinnai RU199iN (199k BTU, condensing): Rinnai 104000045 service valves, concentric termination kit when aesthetics matter, Rinnai thermal bypass for retrofit, Intermatic whole-house surge. Noritz NRC66DV (140k BTU, compact): 3/4" service kit, 2" PVC/PP vent under manufacturer limits, neutralizer, and a Grundfos Comfort retrofit pump when no return line.
We carry Bradford White Infiniti K and K‑Series accessories, too. Ask us for spec sheets and clearances by model—we’ll print them at the counter. That’s the advantage of a plumbing supply shop that lives and breathes tankless.
Buying Smarter: Inventory, Pricing, and Real Value vs. Gimmicks
I’ll be blunt. Coupon codes are great for phone chargers, but not for gas appliances feeding a family’s hot water. Still, we know budgets matter. We do offer fair pricing—and yes, if you’re hunting a supply house discount code, supply house coupon codes, or a supply house promo code, call us. We extend contractor accounts, bulk discounts, and periodic promos on valve kits, venting, and recirc pumps. You’ll save more with a correct first install than any supply house coupon ever gives you.
And because we’re the best plumbing supply option in the region, we maintain the largest on-hand inventory so your crew doesn’t wait. While other suppliers focus on quantity, Plumbing Supply And More prioritizes quality and expertise—we pair competitive pricing with gear that works. We routinely beat big box on total project value.
Local Expertise, Code Knowledge, and Delivery That Keeps Schedules On Track
We’re the local plumbing supply partner serving contractors throughout our region with same-day delivery inside a 40–60 mile radius, plus emergency runs when a job stalls. Our counter team consists of former installers who’ve hung hundreds of units. If you’ve ever typed “ closest plumbing supply” or “ plumbing shop near me” mid-job, you know how much it matters to get the right box the first time.
- Need late-afternoon vent elbows? We run them out. Need a neutralizer media refill before a Monday inspection? We’ll stage it Sunday via our 24 hour plumbing supply locker. Property managers: we build standardized kits for your building types, including pressure-reducing valves and mixing valves to meet scald codes.
And yes, we serve walk-ins looking for bathroom plumbing supplies or plumbing parts with the same care we give our contractors. Visit our showroom to see the quality difference.
Who We Serve: Pros, DIY, Property Management, and Retail Customers
- Professional Contractors & Plumbers: We set up contractor plumbing supply accounts, bulk pricing on isolation kits, and offer submittal packages with spec sheets. Need wholesale plumbing supply pricing? Ask about volume tiers. Serious DIY Homeowners: Bring photos and line lengths—we’ll help you pick the right vent kit, gas fittings, and recirc configuration. Our experts can walk you through the installation process. Property Managers & Maintenance Teams: Standardized SKUs across properties, rapid delivery, and code-compliant setups. Retail Customers: Better gear than big box, with guidance. When Lowe’s or Home Depot shrug, we solve.
You can shop plumbing supply online for pickup, or call ahead so we stage your order. If you’ve been burned by a random internet plumbing supply cart, give us a shot— Compared to standard plumbing supply houses, Plumbing Supply And More offers unmatched technical support before you drive off.
Accessory Checklist: Five Must-Haves For Nearly Every Tankless Install
- Isolation valve kit with purge ports Correct vent kit (UL‑1738 where required) with terminations Condensate neutralizer (and pump if needed) Properly sized gas line and regulator Water treatment: scale inhibitor or softener based on hardness
Call our technical team for project-specific recommendations and ask about our contractor discount program. Check our current inventory online or call ahead.
FAQ: Tankless Water Heater Accessories
Q: Do I really need a condensate neutralizer on a condensing tankless?
A: Yes—most condensing units produce acidic condensate around pH 3–4. Many jurisdictions we serve require neutralization before discharge. We size Neutra-Safe units to your BTU and anticipated runtime so the media lasts 12–18 months.
Q: Can I vent a condensing tankless with standard PVC from the hardware store?
A: Only if the manufacturer lists PVC as acceptable and the pipe/fittings meet the temperature and listing requirements. We prefer polypropylene (Centrotherm InnoFlue) because it’s purpose-built, easier to install, and stays gas-tight. Non‑condensing units need Category III stainless UL‑1738 vent—no exceptions.
Q: How often should I flush a tankless system?
A: In average city water (5–10 gpg), every 18–24 months. In hard water (15–20+ gpg), every 12 months. Use your isolation valves, a small pump, and descaler solution. We stock Flow-Aide kits and can show you the process in five minutes.
Q: What size gas line do I need for a 199k BTU unit?
A: It depends on length, fittings, and total system load. Many installs need 3/4" or 1" black iron to maintain pressure under full fire; some systems benefit from 2 psi with a point-of-use regulator. Bring your layout—we’ll run the calcs with you.
Q: Is recirculation worth it without a return line?
A: Yes, with the right thermal bypass valve or crossover setup. It won’t be as efficient as a dedicated return, but modern ECM pumps and smart scheduling make it practical. We’ll spec the best option for your layout.
Q: Can I get everything in one stop—including electrical and vent parts?
A: Absolutely. That’s where we stand out as a true plumbing and heating supply partner. We carry the vent systems, condensate pumps, wire, valves, and controllers so you don’t chase parts across town.
Beyond Tankless: Your Full-Service Plumbing Source
If you came here searching the supply house specials “ plumbing supply house near me” or “ plumbers supply co,” you’ll find we’re more than a commercial plumbing supply counter. We stock pvc supply house essentials, heating plumbing supply near me components, and even decorative plumbing supply fixtures for the mechanical room and the master bath. Need economy plumbing supply options for budget projects? We carry reliable, cheap plumbing supplies that still meet code. For contractors, our wholesale plumbing supply company pricing and plumbing wholesale near me pickup make turns fast. From plumbing spares near me to specialty direct plumbing supplies, we’ve got you covered.
We also support crossover trades—think ac supply house and air conditioner supply house accessories that intersect with venting, condensate, and power. We collaborate with contractors plumbing and fire supply teams for mixed-use buildings. That’s the advantage of a knowledgeable plumbing supply places partner that actually understands field conditions.
And yes, we know the online landscape—if you’ve compared to supplyhouse plumbing or shopped plumbing supplies direct, talk to us. Unlike generic big box retailers, Plumbing Supply And More stocks professional-grade components, and we’re here when you need urgent help.
The Bottom Line: Why Pros Choose Plumbing Supply And More
If you’re serious about getting tankless right, the accessories matter as much as the heater. That’s where we earn our keep. Compared to standard plumbing supply houses, Plumbing Supply And More offers unmatched technical support, real inventory, and smarter kits that pass inspection and reduce callbacks. We carry the brands that hold up, and we’ll back them with guidance you can’t get from an algorithm or an aisle associate.
- Visit our showroom to see the quality difference Call our technical team for project-specific recommendations Ask about our contractor discount program and bulk pricing Check our current inventory online or call ahead for will-call staging
Whether you searched for a plumbing supply store, a plumbing supply shop, or the closest plumbing supply with real knowledge, you’ve found your partner. For Plumber Supply House: Tankless Water Heater Accessories, for recirc comfort, for clean venting and neutralization, and for code-ready installs—lean on us. When Home Depot and Lowe’s fall short, contractors trust Plumbing Supply And More to deliver the parts, the know-how, and the follow-through that keep projects on schedule and clients happy.