How We Repair Your Rheem Instant/On-demand Water Heater
Tank and tankless water heaters, instant hot water dispensers and recirculation pumps heat water with gas burners or electric elements controlled by thermostats and safety devices.
Every Rheem model has its own parts list, so we start with the model and serial number on the rating label. That tells us the correct parts and any known issues or service bulletins for your unit.
Safety first: Water dripping from the relief valve can mean too much pressure or temperature. Have it checked promptly.
Common Instant/On-demand Water Heater Problems We Fix
Not enough hot water
Sediment in the tank, a failed lower element, a broken dip tube or a tankless unit that is undersized or scaled.
Rumbling or popping
Sediment build-up boiling under the water.
Leaking
A loose fitting, a faulty pressure relief valve or a tank that has rusted through.
Tankless error codes
Scale, ignition failure, a venting problem or a flow sensor fault.
Rotten egg smell
A reaction between the anode rod and the water; the anode can be replaced.
No hot water
On gas tanks, a pilot or thermocouple problem or a failed gas valve; on electric tanks, a failed element or thermostat or a tripped high-limit.
Quick Checks Before You Call
These are safe for most owners and sometimes solve the problem without a visit:
- Check the breaker or that the pilot is lit
- Press the high-limit reset on electric models (power off first)
- Check the temperature setting
Still not working? Call (844) 442-1500 or try our troubleshooting wizard.
Our 5-Step Repair Process
- Call or book onlineTell us what your Rheem instant/on-demand water heater is doing and when it started. We schedule the first available visit.
- DiagnosisThe technician checks power, controls and the parts most likely to fail, using the model's service data and test modes.
- Upfront quoteYou get the cause, the repair and the price before any work starts. If repair does not make sense, we tell you.
- RepairWe install original or equivalent parts matched to your model and clean up when we are done.
- Test and warrantyWe run the appliance through a full cycle to confirm the fix. The repair is covered by our 90-day parts and labor warranty.
Parts We Replace Most Often
- Heating elements and thermostats
- Thermocouple or flame sensor
- Gas control valve
- Anode rod
- Pressure relief valve
- Flow sensors and igniters (tankless)
Cost and Lifespan
Most instant/on-demand water heater repairs cost $150–$600 including parts and labor, and these appliances typically last 8–20 years. These are national estimates: your exact price comes after the diagnosis. Use the repair vs replace calculator to compare.
Keep It Running Longer
- Descale tankless units yearly, more often with hard water
- Test the relief valve once a year
- Flush tank heaters yearly
Instant/On-demand Water Heater Repair in Florida
We repair instant/on-demand water heaters in 349 cities and towns across Florida. Long, humid summers in Florida push refrigerators, ice makers and AC units in homes across the state hard for most of the year. Hard water is common in Florida, and scale is one of the first things we check on water-using appliances like this one.
Frequently Asked Questions
How much does Rheem Instant/On-demand Water Heater Repair cost in Florida?
Most instant/on-demand water heater repairs fall between $150–$600 including parts and labor. The final price depends on the part that failed and your model. You get an exact quote after the diagnosis and before any work starts.
Can you repair my instant/on-demand water heater today?
Same-day visits depend on technician availability in Florida. Call (844) 442-1500 early in the day for the best chance of a same-day or next-day appointment.
Is the repair guaranteed?
Yes. Parts and labor are covered by our 90-day warranty. If the same problem comes back within that time, we return and fix it.
Do you work on all Rheem models?
We repair current and older Rheem models. Some discontinued parts can be hard to find; if that is the case for your model, we tell you before you pay for a repair.
Should I repair or replace my instant/on-demand water heater?
A instant/on-demand water heater typically lasts about 8 to 20 years. If yours is well inside that range and the repair costs less than half the price of a new one, repairing usually makes sense. Near the end of its life, or when the repair costs more than half of a replacement, replacing is often the better value. We give you an honest opinion either way.