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Limitations
The Remeha 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 e󰀨ective
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 ltration 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 ow rate
of 100l/min is required for the Remeha Flexistor range of cylinders
NOTE: A high mains water pressure will not always guarantee high ow 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
ow rate. At these values outlet ow rates may be poor if several outlets are used simultaneously,
the higher the available pressure and ow rate the better the system performance will be.
The water supply must be of wholesome water quality (Fluid Category 1 as dened by the Water
Supply Regulations 1999). The Remeha 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).
IMPORTANT INSTALLATION NOTE:
WHERE THE INLET SUPPLY TO THE PRESSURE REDUCING VALVE (PRV) IS ROUTED THROUGH
A HEATED SPACE AND IS FITTED WITH A CHECK VALVE OR OTHER FITTING THAT WOULD
PREVENT BACK FLOW, HIGH PRESSURES CAN BE EXPERIENCED IN THE INLET PIPE DUE TO
WARMING THAT CAN CAUSE DAMAGE TO THE PRV OR OTHER FITTINGS ON THE INLET
SUPPLY.
IN THESE CIRCUMSTANCES, THE INSTALLATION OF A MEANS TO ACCOMMODATE
EXPANSION AND THUS LIMIT THE PRESSURE RISE IN THE INLET PIPE IS RECOMMENDED.
REFER TO THE INSTALLATION SECTION FOR FURTHER DETAILS.
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