A tankless water heater in Morton Grove, IL heats water only while a tap is open, passing it over a gas burner or electric element and a heat exchanger instead of storing it in a tank. That removes standby heat loss and the risk of a tank splitting open. It also adds new jobs, because the heat exchanger scales up in hard water and the gas line has to carry a bigger load.
Signs a tankless heater needs service
- An error code on the display that returns after a reset
- Hot water that swings between hot and lukewarm during a shower
- Weaker hot water flow than a year ago
- Kettle-like rumbling or ticking while the unit runs
- A long wait for hot water, or hot water that cuts out
- Visible white crust at the inlet screen or the connections
Flushing and descaling a tankless water heater
Scale is the main enemy of a tankless unit. The water Morton Grove receives from Evanston averages 136 mg/L of hardness in that city's 2023 report, close to 8.0 grains in each gallon. At that level, minerals bake onto the heat exchanger wall every time the burner fires. A thin layer insulates the metal, so the unit works harder to deliver the same temperature, and a thick layer narrows the passage and triggers error codes.
A flush removes the scale by circulating a mild acid through the heat exchanger. Check your manual first, since the manufacturer sets the interval and the approved cleaner. With moderately hard water, a yearly flush is a sensible starting point. A softer schedule can work if the unit runs on softened water.
How a flush is done
- 1Turn off power and gasThe unit must be off and cool before any valve is touched.
- 2Close the isolation valvesService valves on the hot and cold lines let you route flow through the unit alone.
- 3Connect the pump and hosesA small pump circulates descaling solution from a bucket through the heat exchanger and back.
- 4Circulate the solutionThe pump runs for a set time, often close to an hour, until the liquid shows no more fizzing.
- 5Rinse and restoreThe unit is flushed with clean water, the inlet screen is cleaned, the valves are reopened and the plumber checks for leaks and a clean burn.
Many homeowners can handle a flush if the unit has service valves. Without them, a plumber adds a set first. Combustion checks, error code diagnosis and any gas work belong to a licensed plumber.
Is a tankless heater right for your house?
Tankless units shine in households that run several hot water draws in sequence and in homes short on floor space. They are a weaker fit where the gas line is small, the vent run is long or the budget is tight. A tank is simpler and often the better value for a small household with modest demand.
| Question | Tankless | Tank |
|---|---|---|
| Hot water supply | Continuous, limited by flow rate | Limited by tank size, then a recovery wait |
| Floor space | Wall-mounted, small | Needs a floor footprint |
| Gas line and venting | Often upgraded | Usually reuses existing |
| Maintenance | Annual flush in hard water | Tank flush, anode rod check |
| Failure mode | Error codes, scale blockage | Slow rust, then a leak |
Gas line capacity and venting
A tankless burner draws far more gas at once than a tank burner. Nicor Gas serves Morton Grove, and the pipe from the meter has to carry the new unit plus the furnace and the range at the same time. If the line is undersized, the heater shuts down or runs rough when other appliances fire, so the plumber measures the run and calculates the load before ordering.
High-efficiency units use sealed plastic vent pipe, often through a side wall. That changes where the heater can go and how the pipe is sloped. The 2018 International Fuel Gas and Mechanical Codes, which Morton Grove has adopted with local amendments, govern the details. Should you notice a gas odor near the unit, get everyone outside, then dial 911 and the emergency line printed on your gas statement.
What to do if a tankless unit smells of gas
- Leave the building right away, and take everyone with you.
- Do not flip switches, use a phone inside or light anything.
- From outside, call 911 and the gas utility emergency number printed on your bill.
- Call us after the gas company says the home is safe, so a licensed plumber can check the unit and vent.
Thinking about going tankless?
Call and talk through gas line, vent and layout.
Permit and inspection in the village
On the village's permit list, a tankless unit falls under the same heading as a tank, so expect to file an application, which can be done online. Plan review is described as usually finishing within 15 business days. If your project also moves fixtures or runs a new gas pipe, call the village building office on (847) 470-5214 before work is scheduled.
The contractor you hire must carry a village licence for work inside Morton Grove. The state adds its own rule, since plumbers need an IDPH licence, and the public lookup on the IDPH site lets you confirm one in a minute or two. For the wider planning steps, see water heater installation.
Protecting the unit with softer water
Scale is the main wear factor on a tankless unit. A water softener cuts scale at the source and lengthens the time between flushes. At 8.0 grains per gallon, the water is moderately hard, so a softener is an option and not a requirement, and a yearly flush may be enough.
When a tankless unit fails, water heater repair covers the diagnosis side, including gas valves, igniters, flow sensors and error codes.
What moves the price of a tankless project
What changes the cost of a tankless job
- Unit capacity and brand tier: Higher output and more features raise the equipment cost.
- Gas pipe upgrade: A larger line from the meter adds material and labor.
- Vent route: A longer vent run or a new wall penetration adds parts and time.
- Condensate drain and electrical: High-efficiency units need a drain for acidic condensate and a nearby outlet.
- Service valves and water treatment: Isolation valves for flushing and a softener both add to the first cost and cut later service.
Insurance for the home generally stays out of a planned switch to tankless, because policies respond to sudden damage and not to elective improvements. What you should expect from the plumber is a written, clear price set before the first tool comes out.
Want your real number? Call (847) 281-8626.
Morton Grove note
The village does not treat its own water. It buys Lake Michigan water from Evanston, and the shared Morton Grove/Niles commission carries it to the village. Evanston's 2023 figures put hardness at 136 mg/L on average, ranging from 124 up to 152. Expressed in grains, that is nearly 8 per gallon. For a tankless owner, scale will form every year, so mark the flush on a calendar the day the unit goes in.
Source type: Evanston's published 2023 water quality report
Service calls for tankless units reach the neighboring towns too, including Skokie, which gets Evanston water.
Frequently asked questions
Follow the manufacturer's interval. In moderately hard water such as the roughly 8 grains per gallon Evanston reports, a yearly flush is a reasonable starting point. A softener can stretch the interval.
If the unit has service valves, many homeowners can do it with a small pump and the cleaner the manufacturer approves. Without service valves, call a plumber to add them. Gas and combustion work should always go to a licensed plumber.
Maybe not. A tankless burner draws more gas at once than a tank burner, and the line must feed the unit with the furnace and range also running. The plumber measures the pipe and calculates the load first.
The village requires a permit for water heaters, and a tankless unit is a water heater. The application can be filed online, and the village building office at (847) 470-5214 can answer questions about your address.
Common causes are scale in the heat exchanger, a blocked inlet screen, a vent problem or a flow sensor fault. A flush fixes many scale-related codes. Codes that return after a flush need a plumber.
Yes. Calls are taken at every hour, and a same-day visit is offered when the schedule allows. With a gas smell, step outside before anything else and ring 911 and the gas utility from there.