Explanation of BioSafe mode
This is a safeguard against tepid water creating a health hazard*.
The AlphaStat-Plus monitors the water temperature at the upper part of the hot water tank. BioSafe must
always be enabled for Potable water installations.
If the water does not reach a preset temperature called ‘BioSafe’ (Adjustable from 50~70C) every 72 hours
all other functions (except Away) are overridden, the HWC light will flash fast and the electric element turns
ON and heats the water to a safe level. 72 hour timer is approximate only. Biosafe is OFF below 50C.
BioSafe Disclaimer
Senztek NZ Ltd makes the following observations about the BioSafe mode and bacteria in tepid water
based on published scientific articles and laws passed in some countries. Senztek NZ Ltd in no way claims
this information is a guarantee for safe practices or that the recommendations will prevent any or all forms
of tepid water infection. Neither do these recommendations extend to other parts of the plumbing other than
the hot water tank.
* Dangerous organisms can multiply in tepid water (especially 30 to 45ºC) and when aerosoled (e.g. in a
shower) can cause pneumonia type symptoms.
If the water is raised to 50ºC all growth stops, when the water is above 55ºC the organisms start dying and
at 60ºC they die very quickly. Other factors will influence the level of growth or decimation. Copper pipes
and tanks help kill these organisms, as will stainless steel (to a lesser extent) and water flow will keep the
numbers down but sludge and rust deposits will enhance growth.
It is therefore prudent to ensure that any domestic hot water system storage tank is hotter than 60ºC top to
bottom at least once a day. To achieve this may require a tank destratification pump or other similar mecha-
nism as only the Tank sensor is monitoring the cylinder temperature. This is in line with regulations in some
countries and the strong recommendation of Senztek NZ Ltd. The BioSafe function ensures the tank sensor
reaches the BioSafe Value (SolaStat recommends 60C) once a day . This BioSafe temperature is ad-
justable only to allow for sensor interface errors or an even hotter target temperature for greater caution.
19.08-12
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