Tankless Water Heater in Mill Creek, WA

Tankless flush and descale

A flush circulates a descaling solution through the heat exchanger to dissolve mineral buildup. We connect a pump and hoses to the service valves on the unit, run the solution for a set time, rinse, and check the inlet filter. It is a routine job, and it is often all an owner needs.

Scale builds up faster in some water than others. Signs include a drop in hot water temperature, a unit that cycles on and off, error codes that point to flow or temperature, and louder operation. Ask your water utility or check your latest water quality report if you want to know what your supply carries.

Not every unit has service valves. Without them, a flush is harder, and installing valves is an extra step we explain before we start. We do not open the heater's cabinet for a flush, and you should not either.

What drives the cost of a descale

Error codes, beeping and a unit that is not working

Tankless units tell you what is wrong in codes on a display or in blinking lights. The manual lists them, and most codes point to a small number of causes: ignition, flame sensing, flow, exhaust, a temperature sensor or a condensate drain.

Check the easy things. Is the gas supply open? Is the cold water on? Is the unit plugged in or the breaker on? Is the vent clear outside? A blocked condensate line or a closed valve causes many codes.

Stop there. Do not open the cabinet, and do not handle the unit's wiring or circuit boards. If you have already opened it and found burnt wiring or a scorched smell, switch the power off and call us. That is a repair for a technician, and it may mean the board or the whole unit.

Tell the dispatcher the make, model and the exact code. That lets us bring the right parts and check whether your brand is one we can service.

Tankless service, repair and installation

We handle the usual repairs: igniters, flame rods, sensors, fans, flow sensors, condensate traps and inlet filters. We also install new units, and swap a tank for a tankless when the house suits it.

Some repairs are worth doing and some are not. Parts for older units can be hard to find, and a major failure on a unit in its second decade may cost more than a replacement. We tell you when that is the case, rather than bill you for a repair that will not hold.

For a leak at a tankless unit, shut off the water and power to it and call us. A leak from a union or valve is common and fixable, but a leak from the heat exchanger itself is usually a replacement.

Why some companies decline tankless service

Tankless heaters need brand-specific knowledge, test equipment and parts, and many plumbers just do not stock or train for them. Some prefer to replace rather than repair. That is a business choice, and it leaves owners with a unit that might have needed only a flush.

We look at the unit first. If a flush, a filter clean or a small part solves it, that is what we recommend. If we cannot service your brand, we tell you so on the phone, so you are not paying for a visit that ends with no answer.

Is a tankless heater right for my house?

Tankless suits some homes and not others. Endless hot water sounds appealing, but the unit needs a gas line big enough to feed it, a vent that fits, a place on the wall and an electrical outlet for the controls. Electric tankless units need very large circuits that many panels cannot spare.

If you are comparing against a standard tank, see water heater replacement for the other options.

Gas line and venting sizing

A tankless burner draws far more gas at once than a tank burner. The line from the meter, its length and any appliances sharing it all count. If your line is undersized, the unit may not fire at full output, and you get lukewarm water at high demand.

We look at the existing line and talk through whether it needs changing. Gas work may involve other licensed steps, and we say so up front. Permit rules vary, so ask the building department for your address.

Venting is the other limit. Tankless vents are different from tank vents, so an old chimney connection usually has to change. Plan for a side-wall vent and a condensate drain.

Is my old tankless worth keeping?

Some tankless units run well for a long time with regular flushing. A unit around 18 years old that still heats well and has been serviced is often worth another flush and a look. One that throws codes constantly, leaks from the exchanger or has a known parts shortage may not be.

We tell you which side yours falls on. Ask us to look before you decide, because a flush costs less than a new unit.

When a repair is not wise, we can talk through a new tankless or a tank, and the installation page covers how that goes.

Outlying and hillside homes

Some callers ask whether we can reach a rural or mountain home. We serve Mill Creek and nearby towns, including Bothell, and farther addresses depend on the dispatcher. Call the 24/7 line with the address and the unit, and we will say whether it is something we can do.

Homes on well water, propane or long gas runs need extra questions, because scale and fuel supply differ. Tell us before we come.

Mill Creek homes and tankless

Original-plat homes from the late 1970s and 1980s often have a tank in a closet with a chimney vent. Moving to tankless means a new vent path and a gas line check. Newer parts of the city, including Town Center area homes and The Farm at Mill Creek, are likelier to have a layout planned for a wall unit.

Western Washington is wet in fall through spring. A condensate drain outside can drip onto a path, and a vent terminal near a planter can be blocked by growth. We look at both when we plan a unit.

Rental properties and small businesses

Landlords with tankless units in several rentals should schedule flushes, and keep the model numbers handy. A small shop or office with a tankless unit can call about the same service. For wider business needs, see commercial plumbing.