Boiler vs central hot water

kWh to heat water, boiler running cost and comparison with the DHW tariff

Parameters

People

Hot water, L/person/day

Cold water, °C

Heat to, °C

Tariff, UAH/kWh

Heated at night, %

Central DHW, UAH/m³

Boiler + install, UAH

Result

Central DHW cheaper by

392,00 UAH/mo

boiler never pays back

Hot water per day150,00 L

Electricity, kWh/month257,00

Boiler: UAH/month833,00 UAH

Central DHW: UAH/month441,00 UAH

80 L tank, 1.5 kW: heat-up2,80 h

Heating 1 m³ by 45°C takes ≈52 kWh. With a night tariff and a timer, a boiler often beats central DHW — plus independence from outages. Lower the setpoint to 50–55°C: every +5°C ≈ +10% cost. Place the boiler close to draw points — less pipe loss.

À propos de Ballon vs eau chaude centrale

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