What a Rinnai or Rheem code means, what an owner can check, and what the repair costs.
Rheem tankless water heater code 11 starts with a gas valve that is not fully open. Follow Rheem's reset steps, see what a pro checks, costs and warranty
Rheem tankless water heater code 13 is a combustion shutdown tied to the oxygen depletion sensor. See which models show it, what to check, costs, warranty
Rheem tankless water heater P1 code means flow is too low to fire the burner. See Rheem's 0.4 GPM rule, which models show P1, the checks, costs, warranty
Rinnai tankless water heater code 10 flags blocked intake air, exhaust or a full condensate trap. See Rinnai's check order, safe DIY steps, cost, warranty
Rinnai code 11 means No Ignition. See the two checks to make, the steps Rinnai reserves for technicians, dated part prices and what the warranty covers
Rinnai code 12 is Flame Failure. Learn why an instant code 12 points to a wiring short, which vent faults cause it, and what the repair and parts cost now
Rinnai code 61 is a combustion fan motor fault. See Rinnai's fix order, why a reset rarely holds, which models it covers, repair costs and warranty terms
Rinnai code 79 means the leak sensor found water. See which models use it, why condensation trips it, how to reset it safely, repair costs and warranty
Where the rod sits, the OEM part numbers with dated prices, and what the warranty says.
Which anode A. O. Smith fits, the 1-1/16 inch socket it calls for, OEM part numbers priced at two sellers, check intervals and why warranty excludes it
Where the anode sits on a Bradford White tank, OEM part numbers with dated prices, the manual's depletion test, and what the warranty says about the rod
Travel trailer and motorhome units: diagnosis on electric and gas, and replacement by cutout size.
RV water heater not working on electric or gas? Check 12V power, the board fuse, the shared thermal cutoff and ECO, then the relay, per Dometic and Atwood
RV water heater replacement, sourced: 6 and 10 gallon cutout sizes, dated unit prices, published labor ranges, and when a tankless unit fits the same hole
Good to Know
Plain answers on what replacement costs, why a unit fails, when repair stops making sense, and what federal efficiency rules require. Every figure sourced.
A 40 gallon water heater replacement runs $700 to $2,300 installed, averaging $1,650, per Fixr, January 2026
A 50 gallon gas water heater replacement costs $900 to $2,500 installed, typical $1,800
AO Smith water heater repair explained: status light and numeric error codes, what the warranty covers by model line, and how to find an authorized servicer
Angi's average is $1,346, Fixr's is about $1,400, Homewyse's is $1,715
Camper water heater repair: why Suburban and Dometic units won't ignite, typical part and labor costs, and the bypass step that prevents a cracked tank
Cost to replace a water heater like-for-like: $1,586 to $2,254 installed, Homewyse, May 2026
Navien tankless units run $1,075 to $1,535 before install
Rinnai tankless units run $900 to $1,995 before install
Electric tankless water heater cost runs $886 to $996 for the unit, $1,642 to $1,925 installed, per Homewyse, May 2026
Electric tankless install cost runs $1,642 to $1,925 per Homewyse, but a panel upgrade can add $1,500 to $4,500 on top
Electric water heater replacement costs $800 to $1,900 installed, typical $1,300, per Fixr, January 2026
Gas hot water heater repair covers pilot and ignition failure, gas valve faults and backdrafting
One bundled, checkable total for gas tankless installation: unit, labor, venting, gas line upsizing and permit added together, sourced and dated for 2026
Gas tankless water heater cost runs $1,638 to $1,841 for the unit, $3,293 to $3,859 installed, per Homewyse, May 2026
Gas water heater replacement costs $700 to $2,700 installed, typical $1,900
Not sure what's wrong with your water heater? Match the symptom, no hot water, a leak, a smell, a pilot, to the guide with the real diagnosis and cost
Tankless labor runs $600 to $1,850 over 6 to 10 hours, per Fixr and Angi, well past a tank swap's 2-hour minimum, due to venting, gas line and wiring work
Plumbers bill $45 to $200 an hour for water heater labor, per Fixr and Angi, 2026 data
Natural gas water heater replacement costs less than propane once you count the tank, regulator and fuel price gap
See Navien tankless water heater unit prices, how the NPE-A2 and NPE-S2 series differ, and how Navien compares to Rheem, Rinnai and Bradford White in 2026
Navien tankless error codes E003, E012, E016, E030 and more explained: what each means, what to check yourself, and the manual's reset procedure
See how Navien water heater repair support works: what voids the warranty, whether registration matters, and how to find an authorized service provider
Noritz tankless water heater repair explained: what error codes 11, 16, 20 and 90 mean, warranty terms and exclusions, common failure points, and cost ranges
A water heater leak isn't always the tank
Rheem tankless codes A011, A012 and A072 explained: the ignition and flame diagnostic steps from Rheem's service manual, and what triggers a repair
Rheem water heater repair explained: what the LED and LCD error codes mean, what Rheem's warranty covers and excludes, and how to reach an authorized servicer
Rinnai tankless water heater cost is $900 to $1,995 per unit
See what each Rinnai tankless water heater error code means, from ignition and airflow faults to scale build-up, plus what a homeowner can safely check first
Rinnai water heater repair: what the SE+ warranty covers and excludes, how to find an authorized servicer, and what happens when you call Rinnai support
Tank installs run $1,586 to $1,843; tankless runs $1,642 to $3,859
Installed cost, efficiency, hot-water capacity, noise and 2026 rebates compared
Unit $1,500 to $3,000; installed $2,000 to $4,600, plus the extras that move the price
A tankless water heater flush costs $100 to $350 depending on who does it
Tankless water heater maintenance cost runs $150 to $386 a visit, or $100 to $300 for a DIY kit
Converting a tank water heater to tankless adds gas line, venting and electrical costs a straight tankless swap skips, itemized and sourced for 2026
A sacrificial anode rod protects the tank from corrosion
A failed element means no hot water or lukewarm water on an electric tank
See what a water heater expansion tank costs to replace, why closed systems require one by code, signs the old one has failed, and if DIY is realistic
Water heater repair prices span $75 to $2,000 by part
A 50 gallon water heater replacement costs $900 to $2,500 for gas, $700 to $1,900 for electric
No interactive tool here, just the four sourced numbers to add: unit price, labor, removal and permits, plus a worked low, mid and high total, dated 2026
A tank swap costs roughly $1,586 to $2,254 installed, less than tankless or heat pump
A tankless water heater's unit price runs $886 to $1,841; installed gas or electric costs $1,642 to $3,859
A water heater thermocouple replacement costs $150 to $325 for parts and labor on gas units only
A water heater thermostat replacement costs $100 to $250 for parts and labor
Independent Research
Published ranges for tank and tankless replacement, the failures that justify a repair, and the ones that do not. Sourced, dated, and free to read.
