Introduction - Heatrae Sadia MEGAflo Installation Manual

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Introduction

Congratulations on your purchase of a Heatrae Sadia Megaflo High Efficiency un-
vented water heater. The Megaflo is manufactured in the UK from top quality materials
and meets all the latest relevant safety and constructional standards. The high grade
Duplex stainless steel cylinder offers exceptional strength and corrosion resistance
which is backed by a 25 year guarantee. Its performance and insulation levels exceed
the latest requirements of Building Regulation Part L.
The Megaflo unvented water heater can be fed directly from the cold water mains
supply to the property without the need for separate feed cisterns or vent pipes. It is
supplied complete with all its necessary inlet and safety controls, electric immersion
heater(s) and, for indirect units, a cylinder thermostat, thermal cut-out, 2-port motor-
ised valve and wiring centre.
Generally its pressure and flowrate performance will far exceed that from a compara-
ble vented system, thermal store, multipoint instantaneous gas heater or combination
boiler.
The Megaflo requires no separate expansion vessel as any expanded water is
accommodated within an internal air volume.
Figure 1 - Schematic installation details
TO HOT
OUTLETS
ELEMENT /
CONTROLS
HOUSING
PRIMARY
RETURN
PRIMARY
FLOW
BALANCED
T&P RELIEF
COLD WATER
VALVE
CONNECTION
(IF REQUIRED)
DRAIN COCK
INLET
COLD WATER
COMBINATION
VALVE
MAINS
WATER
SUPPLY
EXPANSION VALVE
CORE UNIT
SECONDARY RETURN
TAPPING (IF REQUIRED)
TUNDISH
DISCHARGE
PIPE
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