Water Heater Services
Tankless water heater installation in Oklahoma City is only as good as the gas line, venting and water behind it. We install, repair and service gas tankless water heaters, size the gas supply so the unit can fire at full output, and keep heat exchangers clean with scheduled flushing and descaling. When a tankless unit locks out with an error code, we answer 24/7.
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(405) 309-1873We handle tankless water heaters from the first install through years of service:
Scale is the main enemy of a tankless heater. Minerals in the water collect inside the heat exchanger, and over time that crust acts like insulation. The unit works harder, can overheat and shut itself down, and the heat exchanger can be damaged.
Manufacturers are clear about the schedule. Navien recommends descaling at least once a year and says harder water, higher temperature settings and heavier use all call for more frequent service. Rinnai says to flush mineral deposits at least once a year. Rheem notes that tankless units need periodic descaling rather than a tank-style flush.
Our tankless water heater flushing and descaling service:
If your unit was installed without isolation valves, we can add them so future service goes faster. Where scale builds quickly, pairing the heater with whole-house water filtration or a scale-control cartridge can stretch the time between visits.
Tankless unit showing an error code?
Write down the code and call. We answer 24/7 and can often tell you what it means right away.
| Type | Efficiency range (UEF) | Good to know |
|---|---|---|
| Condensing gas tankless | 0.85 to 0.96 | Most efficient gas option, usually vents with PVC, needs a condensate drain |
| Non-condensing gas tankless | 0.80 to 0.82 | No condensate drain, but venting must be rated for hotter exhaust |
| Gas storage tank | 0.54 to 0.72 | Lower upfront cost, but loses heat while it sits and has a shorter life |
The efficiency ranges above come from Navien's published product data. Gas demand is the big practical difference. A condensing model such as the Navien NPE-240A2 is rated for up to 199,900 BTU per hour of gas input, which is why we check the gas line and meter before any conversion. Some tankless models also include a built-in recirculation pump and buffer tank. If the wait for hot water at far fixtures bothers you, see our hot water recirculation pump service.
We price the job after we see it, and financing is available. If a tank still makes more sense for your budget, our water heater replacement page covers that path, and we will tell you so.
Before and after
Oklahoma City's water comes from five surface reservoirs, and the city's water quality report notes that water picks up naturally occurring minerals from rock and soil on its way there. Those minerals are what form scale inside a heat exchanger, so a yearly descaling is a sensible baseline here.
Winter is the other factor. Colder incoming water in January means a tankless unit has to raise the temperature further, which lowers the flow it can deliver at a given setting. A unit sized only for summer can come up short in a cold snap like February 2021, when Oklahoma City hit minus 14°F. We size for winter. Units on exterior walls or in garages also need their built-in freeze protection working, so do not unplug them for the winter.
Want to know who is installing your heater? Meet the team behind the company.
Local, licensed and insured
24/7
A tankless unit that locks out with an ignition or flame failure code leaves the whole house without hot water. We answer nights, weekends and holidays, ask for the code on the display, and often have a good idea what we are dealing with before we arrive. Many tankless problems trace back to gas supply, venting, scale or a dirty inlet filter, and we check each one in order.
40+ yrs
Converting from a tank to tankless is mostly a gas and venting job. Our team has more than 40 years in the plumbing trade, and our work is licensed and insured. The gas line sizing, vent runs, condensate drain and water connections are handled by plumbers who have done them for decades, not people learning from the box.
4.9★
A tankless water heater can last a long time, but only if the heat exchanger stays clean. We set you up with isolation valves and a descaling schedule that matches your water and your usage, and we explain the maintenance in plain terms. Our 4.9-star rating across 88 Google reviews comes from that kind of follow-through. We take pride in installs that still run well years later.
Google reviews
These guys were great! A breath of fresh air from the usual contractor/service. They cared about fixing the problem not how much they can charge. I had a same day service need, leak in between floors, the day before a trip. They came out same day and presented multiple solutions as well as keen explanations.
Mr. Robert has amazing customer service and work ethic. He fixed our toilet very quickly and explained everything that he was doing, and even showed us the finished product. Awesome work!
After having issues with my bathroom and kitchen plumbing for a few days, I contacted Plumber Oklahoma City, OK Plumbing & Repair this morning. He told me he was very busy, but would work to schedule our repair in with his team.
Service area
We handle tankless water heaters across Oklahoma City and the surrounding metro. Our five largest service towns each have a dedicated page with local details.
Straight answers
Navien and Rinnai both call for descaling at least once a year. Navien adds that harder water, higher temperature settings and heavier hot water use all mean more frequent service. In a busy household, or if you see scale on aerators and shower heads, we may suggest a shorter interval. Your unit's manual has the final word for that model.
Usually, yes, but it is more than a swap. A whole-house gas tankless unit needs a lot of gas at full fire, so the line from the meter often has to be checked and upsized. The old metal flue usually cannot be reused, and condensing units need a drain for condensate. We look at all of it before you decide.
ENERGY STAR gives tankless water heaters a life expectancy of 20 years, longer than any conventional tank model, and Rheem puts typical tankless life at 15 to 20 years or more with proper care. The biggest factor we see is maintenance. A unit that is descaled on schedule and has a clean inlet filter tends to reach that range. A neglected one often does not.
Common causes are a flow rate that drops below the unit's minimum, a scaled heat exchanger that overheats and shuts down, a clogged inlet filter, a gas line too small for full output, or a venting fault. A brief burst of cold between hot draws is normal on many units and can be reduced with a recirculation or buffer setup.
For many households, yes. ENERGY STAR estimates a certified gas tankless unit saves a family of four about $95 a year on gas compared with a standard gas storage heater, and it frees up floor space. The installation usually costs more than a tank swap because of gas and venting work, so we lay out both options side by side.
Talk to a real plumber, any hour
Day, night or weekend, call and talk to a licensed Master Plumber about what is going on.
Call (405) 309-1873