Tankless water heater maintenance in Saratoga Springs, UT comes down to two jobs: flush mineral scale out of the heat exchanger and clean the inlet water filter. Both follow your manufacturer's manual, and the schedule is the manufacturer's schedule, not a number we pick for you. Scale and debris are what choke flow and trip the error codes, so these two jobs prevent most of the service calls on a unit that is otherwise healthy.
Below you will find the flush in order, a table for reading common error code families, and the line where maintenance ends and repair begins. Always have the model's manual open, because valve locations and descaling solutions differ between brands.
Before you open a valve: safety and what you need
A tankless heater holds very hot water and runs on gas or high-power electricity. Switch the unit off the way the manual says, and let the water inside cool so you do not scald yourself at the drain hoses.
Gather these first
- The owner's manual for your exact model, open to the flushing section
- Service valves (isolation valves) on the hot and cold lines, or a plan to have them added
- A small submersible pump and two hoses, or the kit your manufacturer sells
- A bucket large enough for the drained water and the descaling solution
- The descaling solution your manual names, since manuals disagree on which are safe for the unit
The flush, step by step
- Power and gas offTurn off the electrical supply and close the gas valve at the unit, as the manual directs. Let the unit cool.
- Close the isolation valvesShut the cold inlet and hot outlet valves so the heat exchanger is cut off from the house plumbing.
- Connect the hosesAttach one hose from the pump to the cold service port and a second hose from the hot service port to the bucket, so the solution can loop through the unit.
- Circulate the solutionRun the pump for the time in your manual. This is where scale dissolves, so do not shorten the time to save a few minutes.
- Rinse with clean waterDrain the solution, then flush with clean water through the unit as the manual says, until the discharge runs clear.
- Restore and bleed airClose the service ports, reopen the isolation valves, open a hot tap until air clears, then restore power and gas and check for drips.
If your unit has no service valves, a plumber has to cut them in first. That is a small job, and it makes every future flush a half-hour task instead of a half-day one.
The inlet filter takes ten minutes and prevents low flow
Many tankless units have a small screen where cold water enters. Sand, pipe scale and sediment collect on it, and a clogged screen reduces flow until the heater cuts out or shows a low-flow error.
Shut the water off to the unit, relieve pressure by opening a hot tap, then unscrew the filter housing the way the manual shows. Rinse the screen under a tap and look for tears before you reinstall it. Check the screen again after any plumbing work upstream, because new pipe work shakes debris loose.
Need a plumber right now?
The 24/7 line is open. A dispatcher will book a licensed plumber.
Reading error codes without guessing
Every brand uses its own code list, so the exact number matters and the manual explains it. The families below describe what most codes point toward, so you know what to check before you call.
| Code mentions | What it usually points to | What you can check |
|---|---|---|
| Ignition or flame | No gas reaching the burner, or a burner that will not light | Gas valve open, another gas appliance working. Do not open the burner compartment. |
| Exhaust or vent | A blocked or disconnected vent path | Outdoor vent end clear of snow, debris or nests. Leave vent repair to a plumber. |
| Over-temperature or overheat | Scale on the heat exchanger or low flow | Inlet filter clean, valves fully open, then a flush |
| Flow or low flow | A clogged inlet screen, a partly closed valve or a fixture issue | Filter, isolation valves, whether only one fixture is affected |
| Power or communication | No supply to the control board, or a loose connection | Outlet and breaker, then call if the code returns |
Look up the exact code in your manual. A code that returns after a reset needs a plumber.
How often to flush: follow the manufacturer's schedule
We do not give a calendar number here because the right interval comes from the manufacturer's schedule for your model, and some makers tie warranty terms to documented upkeep. Write the date of each flush on the unit or in your phone.
Your water changes the picture. Harder water leaves more scale, so a household with a softener may need less frequent flushing than one without. The manual sets the baseline and your results adjust it, such as a falling hot water flow or a code that keeps coming back.
When maintenance becomes repair
A flush will not fix a failed igniter, a cracked heat exchanger, a bad flow sensor or a leaking fitting inside the cabinet. If water drips from the unit, if you smell gas, or if the same code returns after a clean filter and a flush, stop and call.
Our water heater repair team handles those faults, and the tankless water heater page lists the service work we do on these units. If you smell gas, leave the building first and call the gas utility from outside, or call 911.
Serving homes beyond the city line
We dispatch from Saratoga Springs and also take tankless service calls in American Fork and Lehi. The maintenance steps above are the same wherever the unit is, because the manual is the guide.
Saratoga Springs: what the city water report tells you about scale
The City of Saratoga Springs 2024 Annual Drinking Water Quality Report lists total dissolved solids from 144 to 672 ppm and no hardness value. The USGS classes hardness as soft at 0 to 60 mg/L, moderately hard at 61 to 120, hard at 121 to 180 and very hard above 180.
Because the city report does not list hardness, test your tap or ask your water utility, then use the result to decide how tightly to follow the manufacturer's flush schedule.
Your water comes from city wells and surface water from the Central Utah Water Conservancy District, so the mix can vary by season and by where you live in town. A single test shows one day, and a repeat test later in the year shows how much it moves.
Source: city utility page
Frequently asked questions
Many homeowners can if the unit has service valves and the manual shows the steps. You need the right hoses, a pump and the solution the manufacturer approves. If you smell gas or see water inside the cabinet, stop and call a plumber.
Check the manual. Some manufacturers name vinegar and others name their own descaling product or advise against certain acids. Use what your model's manual lists, and run it for the time it states.
A clogged inlet filter, scale in the heat exchanger and a partly closed valve are the usual causes. Check the filter and the valves first, then run a flush. If the display shows a code, look it up in the manual.
Not always. The manual may allow owner maintenance. A plumber is worth calling when the unit has no service valves, when a gas or vent fault shows up, or when a flush does not bring flow back.
The city's 2024 report lists total dissolved solids of 144 to 672 ppm and no hardness value. Dissolved solids are not hardness, so you cannot tell scale risk from that number alone. Ask your water utility for hardness or test your tap, then set your flush plan with your manual.
Still unsure? Call (385) 488-1892
Sources and references
Local facts on this page come from public pages like these. The city lists the 2021 International Plumbing Code (IPC) as adopted, and permit rules vary by job, so ask the Saratoga Springs building department before work starts. Page last reviewed 2026-10-15.