Professional water-side maintenance for Rinnai tankless units. Inlet filter replacement and full vinegar descale flush — performed by trained technicians who protect your warranty and your investment.
We handle everything. No surprises, no upsells — just reliable annual maintenance that protects your investment.
Choose your service, pick a time, and receive a written service agreement before we arrive. No surprises.
Our trained tech inspects the unit, confirms scope of work, and reviews the service agreement with you on-site.
Water-side maintenance only: inlet filter replacement and/or full 45–90 minute vinegar descale flush.
You receive a digital service report with photos, steps completed, and your next recommended service date.
FlushPro specializes exclusively in water-side maintenance. We do two things, and we do them exceptionally well.
Your Rinnai's inlet filter is the first line of defense against sediment, debris, and mineral buildup — and most homeowners never replace it. A clogged filter chokes water flow, triggers error codes, and forces your unit to work harder every single time you turn on a tap. FlushPro uses The Tankless Tool® — the only professional-grade removal tool engineered specifically for Rinnai units — and installs a genuine Rinnai H98-510-S OEM-compatible filter assembly. This is not a generic part. It's the right filter, installed correctly, every time.
Included in every visitWe circulate 3 gallons of plain white distilled vinegar through the heat exchanger for 45–90 minutes — exactly per Rinnai's official recommendation. Dissolves mineral scale buildup that reduces efficiency and triggers error codes. No chemical descalers, ever.
Included in every visitFlushPro does one thing: a complete annual maintenance visit that includes both inlet filter replacement and a full vinegar descale flush. We don't offer partial services — because partial maintenance isn't maintenance. Every visit covers everything your Rinnai needs to run at peak efficiency for another year.
One flat rate · All inNo hidden fees. Price is set by unit accessibility — you'll know the exact cost before we begin.
Unit in a garage, utility closet, or mechanical room with standing room.
Unit in a walk-in crawl space where the technician can stand or move freely.
Unit requires crawling to access. Confined space with limited mobility.
We're transparent about exactly what we do — and what we don't. Read these terms before booking.
All FlushPro services are designed to be fully compliant with Rinnai's manufacturer warranty requirements:
FlushPro is not responsible for pre-existing warranty violations. Service may be declined if our technician finds:
By signing the FlushPro Service Agreement, the customer acknowledges and agrees that:
FlushPro's total liability for any claim shall not exceed the amount paid for the specific service visit. We are not liable for:
We specialize in preventive maintenance — not repairs. If your unit needs more, here's exactly what we do.
FlushPro technicians are trained exclusively for water-side maintenance. We do not diagnose error codes, replace burners, service gas valves, or open units. When our technician identifies a problem beyond our scope, we follow a clear escalation process to get you the right help fast.
Technician documents the issue with photos and a written description on-site.
You receive a written summary of what was observed and why service was paused or declined.
We refer you to a Rinnai-certified technician in your area who can address the repair properly.
Once repairs are complete, we return to complete your maintenance service.
Error code diagnosis · Gas line service · Internal component replacement · Isolation valve replacement · Venting inspection · Electrical troubleshooting · Warranty repair claims · Any service requiring opening the unit
Prefer to do it yourself? Our 16-page PDF guide walks you through the complete filter replacement and vinegar flush procedure step-by-step — with shopping lists, individual Amazon links, a printable service log, and troubleshooting reference.
(919) 928-2604
Mon–Fri 8am–6pm · Sat 9am–3pm
carterjdell@gmail.com
Response within 24 hours
Chapel Hill, Durham, Raleigh,
Carrboro & surrounding areas