Tankless Water Heater Installation, Repair and Descaling in Meridian

Calling a plumber about tankless usually starts with one of three things: a tank that is failing, a house that keeps running out of hot water, or a tankless unit that has started throwing error codes. Each one leads to a different job. The first two are about choosing and installing a unit, and the last is about keeping a wall-hung heater working through years of mineral build-up.

If your tankless heater is displaying a code, write it down before you call, along with whether it is gas or electric.

Tankless water heater installation in Meridian

Fitting a wall-hung unit is more than a like-for-like swap. The heater fires only on demand, so it needs a burst of fuel that a tank never asks for. Gas models draw a high flow through the supply pipe, which is why the gas line is the first thing a plumber checks. Intermountain Gas serves Meridian, and the meter, the house line and any branches all have to carry the load of the new unit and the existing appliances together.

Tankless water heater repair and troubleshooting

Most tankless faults come down to a handful of causes. A heater that shuts off mid-shower may be starved of gas or choked on scale. One that never reaches temperature can have a failed sensor or a flow rate too low to trip the burner. A heater that flashes a code on its panel is telling you which circuit or sensor to look at, and the manual lists the codes.

• Note the error code and what the heater was doing when it appeared.
• Check the gas shutoff and the power supply to the unit.
• Look at the inlet water filter screen, which can clog with debris.
• Run a single tap to see whether the heater lights with one fixture open.
• Do not open the cabinet, which holds gas and live electrical parts.

Winter matters in an unheated garage. Boise's long-record weather station, the nearest one with published normals, counts about 25 December days and 26 January days with lows at or below 32 F. A tankless unit with water still inside its heat exchanger can crack if the freeze protection loses power, so the location and the electrical feed deserve a look at install time.

Flushing and descaling a tankless heater

Water carries dissolved minerals, and heating it drives them out as scale. A tankless exchanger has narrow passages, so even a thin layer cuts the flow and the heat transfer. The city's 2021 report gives readings that climb above 9 grains per gallon in its hardest service zones, and that is enough to leave deposits over a few years of use.

1. Shut off the gas or power and the water to the unit.
2. Connect two hoses to the service valves, one in and one out, with a small pump and a bucket of descaling solution.
3. Circulate the solution through the exchanger for the time the maker gives.
4. Flush with clean water, then clean the inlet screen and reopen the valves.
5. Restore power or gas, test hot water at a fixture and check the codes are clear.

A unit that has gone without a flush for years can be harder to clear, and scale damage to the exchanger is not reversible. The plumber can tell on the visit whether the flush will bring it back or whether the exchanger needs replacing.

Replacing a tank with a tankless unit: the questions to settle first

Brands differ in venting rules, minimum flow rates and parts availability, and the plumber will often recommend what is easiest to service in your area. What matters at the decision stage is whether the house can support the unit, and whether the household's habits suit it.

• Does the gas meter and house line have the capacity for a tankless load?
• Where will the new exhaust run, and can the old flue be reused?
• Is a condensate drain nearby?
• How many fixtures run at once during your busiest hour?
• Is the heater in a space that can freeze?

Cost is its own topic, so it lives on the pricing guide. This page covers the work.

Tankless questions, answered