Now comes the part most buyers underestimate: installation.
A tankless heater isn't a plug-and-play appliance. Get one thing wrong, and you'll trip breakers, freeze in the shower, or worse.
Here are six installation truths that manuals tend to skip — and how to get them right the first time.
Most homes don't have a spare 30–40 amp circuit waiting for a new appliance.
A 6 kW heater draws about 27 amps at 220V. A 9 kW unit pulls over 40 amps.
You need a dedicated circuit. Not shared with the microwave. Not on the same line as the bathroom lights.
Before you drill anything, check three numbers:
If any of these don't add up, call an electrician first. No adapter or workaround fixes an undersized circuit.
A tankless heater has a minimum flow rate to activate. Usually around 2–3 liters per minute.
If your water pressure is too low, the heater simply won't turn on — no matter how much you paid for it.
This catches people in older buildings, upper floors, and areas with unstable municipal supply.
Check your inlet pressure before buying. Most units need at least 0.02 MPa (3 psi). Below that, you'll need a booster pump.
Also flush your inlet filter regularly. A clogged screen mimics low pressure and kills performance.
Height matters. Too high, and you can't reach the controls. Too low, and water splashes directly onto the unit.
Keep the heater at eye level or slightly above — about 1.5 to 1.7 meters from the floor.
Distance from the shower matters too. The closer the heater is to the point of use, the less heat you lose in the pipes. For a bathroom, install it inside the bathroom — not in a distant utility closet.
Also keep it away from direct spray. IPX4 means splash-proof, not waterproof. Don't mount it where the shower head points directly at it.
Inlet and outlet are not interchangeable.
Mixing them up means cold water hits your heating element from the wrong side — or the unit refuses to start.
Most models mark "IN" and "OUT" clearly. If yours doesn't, the inlet is usually the lower port.
Also use the right fittings. Teflon tape on threaded connections prevents slow drips. Flexible braided hoses absorb vibration and are easier to replace than rigid pipe.
Connecting the water lines is DIY-friendly. Connecting the electrical is not.
A tankless heater draws heavy current. Loose terminals overheat. Wrong gauge wire melts insulation. No ground means a live chassis.
At minimum, have an electrician do three things:
The cost of that one-hour visit is nothing next to the cost of a fire or a shock.
If you're installing in a bathroom, local codes in many countries require a qualified electrician by law. Don't skip this.
Most people mount the unit, close everything up, and then discover the problem.
Instead, test with the cover open.
Turn on the water. Check for leaks at every fitting. Turn on the power. Let it run for a full minute. Watch for error codes, breaker trips, or no heat.
Only after it runs clean should you screw on the cover and tidy up.
This takes ten extra minutes and saves hours of troubleshooting later.
Anlabeier tankless electric water heaters are designed with clear IN/OUT markings, compact wall-mount brackets, and IPX4-rated housings that fit standard bathroom layouts.
The units include built-in safety protections — ELCB, dry-heating cutoff, and over-temperature shutdown — so the margin for installation error shrinks.
Combine that with straightforward electrical specs and responsive support, and you spend less time reading the manual and more time enjoying hot water.
You don't need to be an electrician or a plumber to install a tankless water heater.
But you do need to respect what the machine asks for: a strong circuit, steady water, the right position, and a quick test before you call it done.
Nail these six, and your heater will do its job from day one — quietly and safely.
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