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2.3 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.
NOTE: A high mains water pressure will not always guarantee high flow rates.
Wherever possible the main supply pipe should be in 22mm. We suggest that the minimum supply
requirements should be 0.15 MPa (1.5 bar) working pressure and 20 litres per minute flowrate. At
these values outlet flowrates may be poor if several outlets are used simultaneously, the higher the
available pressure and flowrate the better the system performance will be.
The Megaflo Solar has an operating pressure of 0.3 MPa (3 bar) which is controlled by the Cold Wa-
ter Combination Valve. The Cold Water Combination Valve can be connected to a maximum mains
supply pressure of 1.6 MPa (16 bar). The water supply must be of wholesome water quality (Fluid
Category 1 as defined by the Water Supply Regulations 1999).
2.4 OUTLET/TERMINAL FITTINGS (TAPS, ETC.)
The Megaflo Solar can be used in conjunction with most types of terminal fittings. It is advantageous
in many mixer showers to have balanced hot and cold water supplies. In these instances the bal-
anced cold water supply should be teed off the supply to the Megaflo Solar immediately after the Cold
Water Combination Valve (see Diagrams 4 and 5). Branches to cold drinking outlets should be taken
before the valve.
Outlets situated higher than the Megaflo Solar unit will give outlet pressures lower than that at the
heater, a 10m height difference will result in a 0.1 MPa (1 bar) pressure reduction at the outlet fitting.
NOTE: Accessories should have a rated operating pressure of at least 0.8 MPa (8 bar).
2.5 LIMITATIONS
The Megaflo Solar 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 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).
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