17
- Chemical additions are to be avoided and should only be used after ATAG Heating Technology Ltd has
approved their corresponding use.
- Should you wish to achieve the required water quality by using chemical additives, then this is your own
responsibility. The warranty on the product delivered by ATAG Heating Technology Ltd expires, if the
water quality does not meet ATAG Heating Technology's specications or the chemical additives have not
been approved by ATAG Heating Technology Ltd.
- On installation and during additions or changes at a later stage, ATAG Heating Technology Ltd
recommends to keep a record of the type of water used, its quality at the time, and if applicable, which
additives and quantities were added.
Parameter Value
Water type Potable water
Softened water
pH 6.0-8.5
Conductivity (at 20°C in µS/cm) Max. 2500
Iron (ppm) Max. 0.2
Hardness (°dH / ppm):
Installation volume/capacity
<20 l/kW
1-12 °dH / 17-214 ppm
Installation volume/capacity
>=20 l/kW
1-7 °dH / 17-125 ppm
Oxygen No oxygen diusion allowed during operation.
Max. 5% lling water addition annually
Corrosion inhibitors Refer to Additives Attachment
pH increasing or lowering agents Refer to Additives Attachment
Anti-freeze additives Refer to Additives Attachment
Other chemical additives Refer to Additives Attachment
Solid substances Not allowed
Residues of processing water not forming part of the
drinking water
Not allowed
table 9.3.a
Water quality in DHW facility
Parameter Value
Water type Potable water
pH 7.0-9.5
Conductivity (at 20°C in µS/cm) Max. 2500
Chloride (ppm) Max. 150
Iron (ppm) Max. 0.2
Hardness (°dH / ppm): 1-12 °dH / 17-214 ppm
Number of bacterial colonies at 22°C (number/ml). pr
EN ISO 6222
Max. 100
table 9.3.b
- When the amount of chloride is above the required specications mentioned above in table 9.3.b, in case
of the use of a combi boiler will void the warranty for DHW parts of the boiler.
Potable water: Tap water compliant with the European drinking water guideline:
98/83/EG dated 3 November 1998.
Softened water: Water with partly de-ionised calcium and magnesium.
Demi-water: Virtually completely demineralised water (very low conductivity)
Distilled water: Water no longer containing minerals.
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