How to Choose a Water Heater: Tank, Tankless, Capacity, and Energy

Storage (tank) water heaters keep 50–120 litres hot around the clock. They suit apartments with one bathroom and predictable morning peaks — two showers back-to-back need at least 80–100 litres in temperate settings. Tankless (instant) units heat water on demand and save wall space but require adequate gas pressure or electrical supply.

In older Balkan blocks with limited electrical capacity, a 2 kW instant heater may trip breakers when combined with other loads. Tank models spread consumption over hours. Gas tankless units excel in houses with existing gas lines; electric tanks dominate urban flats.

Rule of thumb: 50 litres for one person, add 20–30 litres per additional regular user. A family of four often chooses 80–100 litres; larger villas may need 120. Oversizing wastes standby heat; undersizing means cold showers when schedules overlap.

Check physical dimensions — standard slim tanks fit bathroom niches common in Soviet-era and post-2000 buildings across the region. Measure door width and ceiling height before ordering online.

Look for enamel-coated tanks, magnesium anodes (replaceable), and good insulation thickness. Energy class labels help compare standby losses; heat-pump water heaters are rare in the Balkans but standard electric and gas models vary by 10–20% in annual consumption.

Timers and night tariffs (where utilities offer them) cut bills for tank units. Instant heaters have no standby loss but high peak draw — verify your panel can handle 6–8 kW if you choose a whole-flat electric flow heater.

Ariston, Tesy, Bosch, and regional brands like Eldom appear across Serbian, Bulgarian, and Albanian stores with different warranty lengths. The same 80-litre tank can differ by €30–80 plus install. commo.cc lists multiple sellers so you compare capacity class and price in one view.

Installation often requires a licensed plumber for gas or high-power electric connections. Factor mount kit, valves, and expansion vessel where needed. Five minutes comparing on commo.cc before autumn peak season routinely saves enough to cover professional mounting.