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5 | Application guidelines

Installer reference guide

ERLA03DAV3 + EHFH03S18DJ3V

Daikin Altherma 3 R F

4P596806-1A – 2020.05

5.4 Setting up the domestic hot water tank

5.4.1 System layout – Integrated DHW tank

A Domestic hot water

a Cold water IN

b Hot water OUT

5.4.2 Selecting the desired temperature for the DHW tank

People experience water as hot when its temperature is 40°C. Therefore, the DHW

consumption is always expressed as equivalent hot water volume at 40°C.

However, you can set the DHW tank temperature at a higher temperature

(example: 53°C), which is then mixed with cold water (example: 15°C).

Selecting the desired temperature for the DHW tank consists of:

1 Determining the DHW consumption (equivalent hot water volume at 40°C).

2 Determining the desired temperature for the DHW tank.

Determining the DHW consumption

Answer the following questions and calculate the DHW consumption (equivalent

hot water volume at 40°C) using typical water volumes:

Question Typical water volume

How many showers are needed per

day?

1shower = 10min×10l/min = 100l

How many baths are needed per day? 1bath = 150l

How much water is needed at the

kitchen sink per day?

1sink = 2min×5l/min = 10l

Are there any other domestic hot water

needs?

—

Example: If the DHW consumption for 2 persons per day is as follows:

▪ 1 showers

▪ 1 bath

▪ 2 sink volumes

Then the DHW consumption = (1×100l)+(1×150l)+(2×10l)=270l