Complete desalination not required
If there is no aluminium (heat exchanger in the gas
boiler or aluminium radiator) in the system, then costly
complete desalination with ion exchange cartridges or
osmosis is not required.
Lime stabilisation can be dangerous
The addition of lime stabilising agents prevents
limescale. However, we advise against doing this.
These agents increase the salt content and result in an
undefined pH value. If the system is filled with large
amounts of water, exactly the same agent must be
used again. Mixing with other water additives or with
antifreeze can result in corrosion.
11.2 Refilling
Fill up heating water
If water refilling in the heating system is required, for
example to adjust the pressure, the same water as
used during initial filling should be used wherever
possible.
If only a small amount of water is to be replenished
(below 10% the system volume), then normal tap
water can be used. This applies, for example, when
replacing a pump or mixer.
The heating system is never to be refilled with
rainwater, as this is usually contaminated and the
pH value is too low.
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