Water Heater Repair
Learn why a tank heater stays cold, drips, rumbles or loses its pilot flame.
Hot water and treatment
Tankless Water Heater Service in Louisville, CO
Because a tankless unit heats water only as it moves through, scale, altitude and venting count for more than they do with a storage tank. When a unit throws an error code, delivers lukewarm water or runs cold in the middle of a shower, service usually starts with a flush and a combustion check.
Call and mention the brand, the error code and how old the unit is.
Common tankless complaints
- An error code on the displayOften ignition, flame or flow sensing.
- Lukewarm or fluctuating waterScale in the heat exchanger or low flow.
- Cold sandwichA brief burst of cold between two hot flows.
Why scale is the main enemy
Minerals in the water leave a crust on the heat exchanger. The crust insulates the metal, so the unit works harder, runs hotter and eventually trips. Flushing with a descaling solution through the service valves removes it.
How often a unit needs flushing depends on the water and on use. Check your utility's annual water quality report for hardness information, and ask the contractor to set an interval based on what they find in the unit.
Altitude and combustion
Gas tankless units burn a lot of fuel quickly, and thin air changes the fuel-to-air balance. Manufacturers publish high-altitude settings, and units installed at Front Range elevations need to be configured accordingly.
If your unit was installed without checking the altitude setting, you may notice soot, error codes or cold spots. A technician can check the combustion with an analyzer and adjust.
Cost
Costs behind tankless service
A flush is a smaller job than a repair or a replacement. These items change the price.
Ask for the maintenance schedule and whether service visits are priced separately.
In Louisville
Scale, cold and Front Range elevation
Water along the Front Range is surface water drawn from mountain streams and reservoirs, and Louisville's supply comes mainly from South Boulder Creek, with Colorado River water added through Northern Water. How hard it is varies by utility, so read your own water quality report instead of relying on general claims.
Cold weather brings a risk of freezing for any unit near an exterior wall or in a garage. Freeze protection and condensate routing need to suit the location.
Venting, condensate and gas supply
Condensing tankless units produce acidic condensate that must drain properly, usually through a neutralizer. A clogged condensate line or neutralizer can stop the unit. The vent must be sized and sealed for the model, and the gas line must supply enough volume.
A common cause of poor performance after a swap from a tank is an undersized gas line. The contractor should check capacity before installation.
Considering a tankless install
Tankless heaters save space and can deliver continuous hot water, but they cost more up front and need maintenance. They suit homes where a tank is cramped or hot water is heavily used.
Ask for a load calculation, the gas line plan, the vent route and the maintenance schedule. Outdoor-mounted units must be protected from freezing.
Compare these hot water services
Water Heater Installation & Replacement
Swap out a dead tank heater for one sized, fueled and vented to suit the home.
Water Softener Installation & Repair
Add a softener, or revive one that quit regenerating, for houses dealing with hard water scale.
Quick answers
What people ask about tankless heater
It depends on water hardness and use. Many manufacturers suggest annual service, and heavier scaling calls for more often. A technician can recommend an interval after inspecting yours.
Codes differ by brand. Common ones relate to ignition, flame, flow, temperature or venting. The manual lists them, and a technician can diagnose the cause.
It can happen between two hot-water uses when the unit has shut off and restarts. Flow settings, scale or a recirculating line can make it worse.
They work, but outdoor units and those near exterior walls need freeze protection. Intake air and condensate lines also need attention.
Call the line and give the error code. A unit that is leaking or smells of gas should be shut off first. Mention where yours is mounted.
Phone in with the fault code shown on the display. If the unit is dripping or you smell gas, shut it off first. Units in garages or outdoors can freeze, so say where yours hangs.
Tankless heater acting up?
Give the brand and the fault code when you call. The dispatcher can find a contractor who services tankless units.