12
Limitations
• The Andrews Flexistor unvented water heater should not be used in any of the following
instances:
•
Solid fuel boilers or any other boiler in which the energy input is not under effective
thermostatic control unless additional and appropriate safety measures are installed.
• Gravity circulation primaries.
• Steam heating plant unless additional and appropriate safety devices are installed.
• Ascending spray type bidets or any other Class 5 back syphonage risk requiring that a Type
AA, AB, AD or AG air gap be employed.
• Water supplies that have either inadequate pressure or where the supply may be intermittent.
• Situations where it is not possible to safely pipe away any discharge from the safety valves.
• Areas where the water consistently contains a high proportion of solids, eg. suspended
matter that could block the strainer, unless adequate filtration can be ensured.
• The installation must be carried out in accordance with the relevant requirements of the
appropriate Building Regulations: either The Building Regulations (England), The Building
Regulations (Scotland) or Building Regulations (Northern Ireland), The Water Fittings
Regulations (England and Wales) or Water Byelaws (Scotland).
Water supply
Bear in mind that the mains water supply to the property will be supplying both the hot and cold
water requirements simultaneously. It is recommended that the maximum water demand be
assessed and the water supply checked to ensure this demand can be met. A minimum flow rate
of 100l/min is required for the Andrews Flexistor range of cylinders
NOTE:
A high mains water pressure will not always guarantee high flow rates.
Wherever possible the main supply pipe should be in 2”. The minimum mains water supply
requirements should be 0.15 MPa (1.5 bar) working pressure and minimum 100 litres per minute
flow rate. At these values outlet flow rates may be poor if several outlets are used simultaneously,
the higher the available pressure and flow rate the better the system performance will be.
The water supply must be of wholesome water quality (Fluid Category 1 as defined by the Water
Supply Regulations 1999). The Andrews Flexistor is to be used for the storage of wholesome
water (max. 250mg/l chloride).
Note: In hard water areas it is recommended that service intervals are reduced to monitor
scale build up on the immersion heaters.
Water container:
Duplex stainless steel. 100% pressure tested to 2.25 MPa (22.5 bar).
Summary of Contents for Flexistor 1000
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