TOTAL COST

Gas water heater.

Electric instantaneous Dafi water heater

Necessary costs :

- cold and hot water pipes

- gas installation

- chimney and ventilation

Necessary costs :

- single pipe - cold water supply only

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Cost of installation: high

Cost of installation: lower

Maintenance and inspection of the installation:

- gas

- chimney

- ventilation

Maintenance and inspection of the installation:

- not required

- not required

- not required

SAFETY

Gas explosion hazard

Gas poisoning hazard

Exhaust gases poisoning hazard

SAFE

SAFE

SAFE

EFFICIENCY

Most of the heat energy is wasted through the chimney

Longer waiting time for hot water if tap point is distant from the heater (the heat is absorbed by the walls)

All of the electricity is transformed into hot water, which is instantly available.

Variety of powers enable better adjustment of the heater to its purpose (from 3,7 to 7,3kW).

Usage of water and electricity is very economical and rational.

HOT WATER AVAILABILITY

In the central water heating system any malfunction of a central gas water heater interrupts the supply of hot water throughout the whole building.

Unlimited and instant access to hot water.

Water storage heater; Power: 2kW, capacity: 120l

ESSENTIAL FEATURES

Electric Instantenous DAFI Water Heater, Power: 4,5 kW

Water storage heaters do not maintain constant temperatures. Continuously drawing off water cools the system.

CONSTANT TEMPERATURE

Instantaneous DAFI water heater continuously provides hot water at constant temperature no matter how much water is being used

High

ELECTRICITY CONSUMPTION

Low

128 l

24-HOUR DEMAND FOR WATER BY 4-PEOPLE FAMILY

128 l

3h x 2kW = 6 kW

ELECTRICITY CONSUMPTION REQUIRED TO HEAT WATER UP TO 45°C

Productivity:

2 l/min. Time the heater is on:

128 l : 2 l/min = 64 min.

64 min. x 4,5 kW/h = 4,8 kW

21 h x 0,25 kW/h = 5,25 kW

ELECTRICITY CONSUMPTION REQUIRED TO SUSTAIN PROPER TEMPERATURE

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11,25 kW

TOTAL 24-HOUR CONSUMPTION OF ELECTRICITY

4,8 kW

375 kW

MONTHLY HEATER ELECTRICITY CONSUMPTION

144 kW