Heatrae Sadia Megalife 100E User manual

Megalife Vented Cistern Fed Water Heater
Installation manual
SOLAR INDIRECTDIRECT

2
Section Page
1 Introduction............................................... 2
2 General requirements .............................. 4
3 Installation - general................................. 5
4 Installation - direct units........................... 7
5 Installation - indirect units........................ 8
6 Commissioning ......................................... 11
7 User Instructions ....................................... 12
8 Maintenance ............................................. 13
9 Fault Finding & Servicing......................... 14
10 Dimensions & Specifications ................... 16
11 Guarantee.................................................. 19
12 Contacts .................................................... 20
Contents
Thank you for your purchase of a Heatrae Sadia Megalife cistern fed vented water heater. The Megalife 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 and is backed by a 25 year cylinder
guarantee. Its performance and insulation levels meet the latest requirements of Building Regulation Part L.
The Megalife vented water heater must be fed from a cold water feed cistern located above the water heater and hot
outlets to be served. The unit must have a suitable vent pipe installed on the outlet that is arranged to discharge over
the cold water feed cistern.
Direct units are supplied with two electric immersion heaters (depending on model), which incorporate an adjustable
thermostat and an over-temperature thermal cut-out.
Indirect units are supplied fitted with a thermostat and over-temperature thermal cut-out for the control of the primary
heat input to the Megalife from the boiler selected. All indirect models are also supplied with one electric immersion
heater for use as a back up heat source should the primary heat source be switched off.
Please read and understand these instructions before starting work.
Please leave this leaflet with the user following installation
1: Introduction

3
G3 Requirements (extracts taken from G3 regulations)
(2) A hot water system, including any cistern or other vessel that supplies water to or receives expansion water from
a hot water system, shall be designed, constructed and installed so as to resist the effects temperature and pressure
that may occur either in normal use or in the event of such malfunctions as may reasonably be anticipated, and must be
adequately supported.
(3) A hot water system that has a hot water storage vessel shall incorporate precautions to:
(a) prevent the temperature of the water stored in the vessel at any time exceeding 100°C: and
(b) ensure that any discharge from safety devices is safely conveyed to where it is visible but will not
cause a danger to persons in or about the building.
In the Secretary of State’s view Requirement G3(3) will be met for a hot water storage system that has a vented storage
vessel if:
a. the storage vessel has a suitable vent pipe connecting the top of the vessel to a point open to the atmosphere
above the level of the water in the cold water storage cistern and over it; and,
b. in addition to any thermostat, either the heat source, or the storage vessel is fitted with a device that will
prevent the temperature of the stored water at any time exceeding 100°C; and,
c. the hot water system has pipework that incorporates a provision for the discharge of hot water from the safety
devices to an appropriate place open to atmosphere where it will cause no danger to persons in or about
the building.
Vented hot water storage systems
3.12 Vented hot water storage systems should incorporate a vent pipe of an adequate size, but not less than 19mm
internal diameter, connecting the top of the hot water storage vessel to a point opne to the atmosphere obove and over
the level of the water in the cold water storage sytem.
3.13 In addition to the vent pipe referred to in 3.12 and any thermostat provided to control the temperature of the
stored water to a desired temperature, vented hot water storage systems should incorporate either:
a. for all direct heated sources, a non-self-resetting energy cut-out to disconnect the supply of heat to the storage
vessel in the event of the storage system overheating: and,
for all indirect heat sources, an overheat cut-out to disconnect the supply of heat to the storage vessel in the
event of the stored water overheating so that the temperature of the stored water does not exceed 100°C.
3.14 Vent pipes should discharge over a cold water storage cistern conforming to BS 417-2:1987. Specification for
galvanized low carbon steel cisterns, cistern lids, tanks and cylinders. Metric units; or BS 4213:2004 Cisterns for domestic
use. Cold water storage and combined feed and expansion (thermoplastic) cisterns up to 500 litres. Specification; as
appropriate.
3.15 The cold water storage cistern into which the vent pipe discharges should be supported on a flat, level, rigid
platform which is capable of safely withstanding the weight of the cistern when filled with water to the rim and fully
supporting the bottom of the cistern over the whole of its area. The platform should extend a minimum of 150mm in all
directions beyond the edge of the maximum of the cistern.
Note: When an existing metal cistern is replaced, or a plastic cistern is replaced by one with larger dimensions, the
existing support should be upgraded, as necessary, with one in accordance the paragraph 3.15.
3.16 The cistern should be accessible for maintenance, cleaning and replacement.

4
2: General Requirements
IMPORTANT : PLEASE READ AND UNDERSTAND THESE INSTRUCTIONS BEFORE INSTALLING THE MEGALIFE
WATER HEATER. INCORRECT INSTALLATION MAY INVALIDATE YOUR GUARANTEE.
THIS APPLIANCE CAN BE USED BY CHILDREN AGED FROM 8 YEARS AND ABOVE AND PERSONS WITH REDUCED
PHYSICAL SENSORY OR MENTAL CAPABILITIES OR LACK OF EXPERIENCE AND KNOWLEDGE IF THEY HAVE
BEEN GIVEN SUPERVISORY OR INSTRUCTION CONCERNING USE OF THE APPLIANCE IN A SAFE WAY AND
UNDERSTAND THE HAZARDS INVOLVED. CHILDREN SHALL NOT PLAY WITH THE APPLIANCE. CLEANING AND
USER MAINTENANCE SHALL NOT BE MADE BY CHILDREN WITHOUT SUPERVISION.
WARNING: Do not switch on if there is a possibility that the water in the heater is frozen.
THE MEGALIFE MUST BE FED FROM A COLD WATER FEED CISTERN. A SUITABLE VENT PIPE MUST BE
INSTALLED.
2.1 Siting the Megalife (see Fig. 01, below)
The Megalife range of water heaters must only be installed as CISTERN FED VENTED units supplied from a cold
water feed cistern at an appropriate head height above the heater and outlet points. Ensure that the feed cistern
height above the heater does not exceed its maximum rated pressure of 40 metres (4 bar). The feed cistern should
comply with the requirements of Schedule 2 Section 7 Paragraph 16: Cold Water Services to the Water Supply (Water
Fittings) Regulations 1999 (previously Water Byelaw 30).
A vent pipe MUST be connected to the outlet of the heater. This must rise continuously and be arranged to discharge
into the feed cistern. The vent pipe must have a minimum bore diameter of 19mm.
DO NOT connect directly to the mains water supply.
DO NOT connect any pressure relief device or other valves to the vent pipe of this heater.
DO NOT install in a position where the heater is liable to be subject to frost conditions.
The Megalife unit must be vertically floor mounted or on a suitable plinth. It can be placed anywhere convenient
provided the vent pipe can be correctly installed. Ensure that the floor or supporting plinth is of sufficient strength
to support the “full” weight of the unit (refer to table 04 on page 17 for unit weights). Ideally the heater should be
sited close to the point where hot water is required most frequently. Pipe runs should be kept as short as possible
for maximum economy. Access to associated plumbing connections, immersion heaters and indirect controls should
be possible for servicing and maintenance of the system.
2.2 Outlet/Terminal Fittings (taps, etc.)
The Megalife can be used in conjunction with most types of terminal fittings. In a cistern fed system the pressure at
the outlet fittings is due to the head height of the cold water feed cistern above the outlet point. When choosing
suitable fittings ensure they will operate at the pressure available at the outlet point.
WALL
Min 250mm Min 250mm
Fig. 01: Siting the Unit

5
3: Installation - General
3.1 Pipe Fittings
All pipe connections to the Megalife are made via 22mm compression fittings directly to the unit (nuts and olives
supplied). The fittings are also threaded 3/4” BSP male parallel should threaded connections be required.
3.2 Cold Water Supply
A 22mm cold water supply is recommended from the cold water feed cistern. No other connection should be taken
from this supply. A servicing valve or stop valve with a fixed washer plate should be incorpoarted in a convenient
and accessible position in the cold feed pipe. The cold feed pipe should be connected to the heater connection
marked with a BLUE collar.
3.3 Drain Tap
A suitable draining tap should be installed at the lowest point of the cold feed pipe between the cold water service
valve and the heater to facilitate draining the heater.
3.4 Outlet Pipework
The outlet pipework should be connected to the heater connection marked with a RED collar in the centre of the
top cover. The vent pipe must be teed into the outlet pipe (see section 3.5 below). Outlets above the heater can be
teed off the vent pipe. Ideally the pipework from the heater to the outlet fittings should be in 22mm pipe with short
runs of 15mm pipe to the terminal fittings. Pipe sizes may vary due to system design.
3.5 Vent Pipe
A vent pipe MUST be connected to the outlet of the heater.
The vent pipe must rise continuously and be arranged to discharge into the cold water storage cistern.
The vent pipe must have a minimum bore diameter of 19mm.
No valves should be fitted to the vent pipe. It is not acceptable to replace the vent pipe with a pressure relief
device.
The hot water distributing pipes can be teed off the vent pipe. If fitting a shower booster pump particular attention
should be made to the manufacturer’s instructions regarding the positioning of the hot water tapping to prevent
air entrainment via the vent pipe.
3.6 Secondary Circulation
If secondary circulation is required it is recommended that it be connected to the Megalife cylinder as shown in Fig.
07, page 11. A 1/2” BSP female threaded boss is provided (supplied blanked with a 1/2” BSP plug) for the connection
of a secondary circulation return pipe.
The secondary return pipe should be in 15mm pipe and incorporate a check valve to prevent backflow. A suitable
WRAS approved bronze circulation pump will be required.
In direct electric installations where a secondary circulation is required particular attention should be paid by the
installer to maintain the returning water temperature (guidelines state that a minimum of 55°C return temperature is
advisable) . Factors such as, but not limited to, secondary circulation flow rates, minimising heat loss of all secondary
circuit pipework and timed operation during periods of high demand are critical to the correct operation and longevity
of the heating element(s) and thermostats.
Secondary circulation is not recommended for direct electric units using off-peak tariffs where the secondary circulation
is not controlled in conjunction with the heat source as performance can be affected.

6
OUTLET/VENT
(HOT)
COLD
HOT
COLD
HOT
INLET WATER SUPPLY
CISTERN TANK
COLD
MAINS
SUPPLY
MAX HEAD 40m
VENT PIPE
Stop Valve
OVERFLOW PIPE
Fig. 02: Typical Vented Installation - Schematic

7
4: Installation - Direct Units
4.1 Immersion Heater(s)
The Megalife is supplied with two factory fitted immersion heaters (120L - 210L) and one immersion heater on the
100L model. Each immersion heater is rated 3kW at 240V (2.8kW at 230V)
If both immersion heaters are not required a boss can be plugged with the aid of a blanking plug available from
Heatrae Sadia (order Heatrae Sadia part no. 95 605 881).
4.2 Wiring (see Fig. 03, below)
All electrical wiring should be carried out by a competent electrician and be in accordance with the latest I.E.E.
Wiring Regulations. Each circuit must be protected by a suitable fuse and double pole isolating switch with a contact
separation of at least 3mm in both poles. The immersion heater(s) should be wired in accordance with Fig. 03, below.
The immersion heater(s) MUST be earthed. The supply ( HOFR 1.5mm² min ) cable must be routed through the
cable gland provided and the outer sheath of the cable firmly secured by tightening the screw on the cable gland.
Replace the immersion heater cover(s) before operating.
DO NOT operate the immersion heater(s) until the Megalife has been filled with water.
4.3 Operation
Switch on the electrical supply to the immersion heater(s) and allow the unit to heat up. Check that the thermostat
operates correctly. A storage temperature of approx. 60ºC is recommended. If necessary the temperature can be
adjusted by inserting a flat bladed screwdriver in the adjustment spindle on top of the immersion heater thermostat
and rotating (see Fig. 04, page 9). The full adjustment represents a temperature range of between 10ºC and 72ºC.
4.4 Safety
DO NOT BYPASS THE THERMAL CUT-OUT(S) IN ANY CIRCUMSTANCES.
DISCONNECT FROM THE MAINS SUPPLY BEFORE REMOVING ANY COVERS.
NEVER ATTEMPT TO REPLACE AN IMMERSION HEATER OTHER THAN WITH THE RECOMMENDED HEATRAE
SADIA MEGALIFE SPARE PART. ( see page 14)
Fig. 03: Electrical connection (direct schematic)
NL
1.5mm2 3 Core
HOFR sheathed
cable

8
5: Installation - Indirect Units
5.1 Boiler Selection
The Megalife indirect models are suitable for use with most gas, oil or electric boilers. The boiler used can either be
a sealed system or open vented type. The maximum primary circuit pressure is 3.5 bar. If an open vented type boiler
is used it must be fed from a separate boiler feed and expansion cistern, it MUST NOT be fed from the Megalife
cold water feed cistern.
The primary flow from the boiler MUST be pumped. Gravity circulation will not work due to the special design of
the primary heat exchanger. It is recommended that an air bleed point or automatic air vent is incorporated in the
primary return pipework close to the Megalife unit to aid in bleeding air from the primary heating coil.
The boiler should be fitted with adequate thermal control. This will normally include a primary flow thermostat and a
safety over temperature cut-out. The boiler flow temperature should usually be set to 82oC (maximum flow temperature
to primary heat exchanger 90oC).
The boiler cannot be vented through the Megalife unit.
5.2 Indirect Thermal Controls
Control of the storage temperature when indirectly heated is provided by the fitted cylinder thermostat. The control is
located under the white plastic cover located to the right of the indirect coil connections. If necessary the temperature
can be adjusted by inserting a flat bladed screwdriver in the adjustment knob and rotating. The minimum thermostat
setting is 10°C. Adjustment represents a temperature range of 10°C to 72°C (See Fig. 04, page 9). If in any doubt
contact a competent electrician.
5.3 Wiring
All electrical wiring should be carried out by a competent electrician and be in accordance with the latest I.E.E.
Wiring Regulations.
The Megalife indirect thermostat and thermal cut-out are factory pre-wired. It is recommended that these controls are
wired in series with a suitable 2 or 3 port motorised valve to control the primary flow through the heater coil. Wiring
to external controls is made via the terminal block fitted. The cable should be routed through the aperture in the
terminal cover and secured using the cable grip provided. The indirect thermal cut-out MUST NOT be bypassed.
5.4 Heating System Controls
The controls provided with the Megalife will ensure the safe operation of the Megalife when heated by a primary
heat source. Other controls will be necessary to control the space heating requirements and times that the system is
required to function. Depending on the boiler selected, heating circuit design and controls used it may be beneficial
to incorporate a system bypass in the auxillary heating system pipework.
The Megalife is compatible with most heating controls, examples of electrical circuits are given in Fig’s 05 and 06,
page 10. However, other systems may be suitable, refer to the controls manufacturers’ instructions, supplied with
the controls selected, for alternative system wiring schemes.
5.5 Immersion Heater
The Megalife indirect units are supplied with an immersion heater which can be used as an alternative heat source
should the boiler supply need to be isolated from the Megalife unit. Refer to Sections 4.1 to 4.4 and Fig. 03, page 7
for details of the wiring and operation of the immersion heater.

9
Fig: 04 - Electrical connection (indirect schematic) and temperature adjustment
LN
1 2 3
Element Connections
1.5mm2 3 Core
HOFR sheathed
cable
Indirect control
wiring
SPINDLE POSITIONS
= MINIMUM TEMP 10ºC = MAXIMUM TEMP 72ºC
= APPROX 60 °C
ROTATE SPINDLE CLOCKWISE FOR TEMPERATURE INCREASE
AND COUNTER CLOCKWISE FOR TEMPERATURE DECREASE
THERMAL CUT-OUT RESET BUTTON
TEMPERATURE ADJUSTING
SPINDLE

10
Fig: 05. Schematic Wiring Diagram - Basic 2 x 2 port valve system
Fig: 06: Schematic Wiring Diagram - 2 port valve in conjunction with 3 port mid position valve system. (Y plan).
NOTES: Control terminal numbering may differ from those shown.
Refer to instructions with controls selected.
A double pole isolating switch must be installed in the mains supply.
All earth connections must be connected back to the mains earth supply.
L
1
N
23
HTG
ON
DHW
ON LN
23
1
L
2
N
345 6 7 8 9 10
12 3 45 6 7 8 9 10
(Supply)
12 3
G
1
Br Bl
2
0GY
3
G
1
Br Bl
2
0
13 2
2
L
N
Programmer Boiler Pump
Zone valve (HTG)
Cylinder terminal block
Room stat Zone valve (DHW)
Junction box
3
2
3
L
N
Bl
GY
WGO
1 2 3
HTG
ON DHW
ON
Pump
Boiler
3-port mid position valve
(DHW) 2-port
Programmer
Cylinder terminal block
(supplied fitted)
1
Room stat
3
NOTES:
1. A double pole isolating switch must be installed in the mains supply.
2. All earth connections must be linked back to the mains earth supply.
3. Assumes basic boiler with external pump.
4. Use copper links supplied to make connections between terminals.
5. Do not mount wiring centre on cylinder.
6. The above diagram is for guidance only.
KEY
Bl Blue
Br Brown
G Grey
O Orange
GY Green/Yellow
DHW Domestic Hot Water
HTG Heating
DHW
OFF
12 3 4 5 6 7 8910 11 12 13 14 15 16
Bl
Br
GO
GY
2L
N L
N
LN

11
6.1 Filling The Unit With Water
• Ensure that all fittings and immersion heater(s) are correctly fitted and tightened.
• Open the highest hot tap in the system.
• Open the mains cold water supply to the cold water feed cistern.
• Open the service valve or stop valve fitted in the cold feed pipe to the unit. Allow the unit to fill. When water
flows from the hot tap allow to run for a few minutes to flush through any dirt or swarf, then close tap.
• Allow cold water feed cistern to fill to the water line. Adjust the float valve if necessary.
• Open successive hot taps to purge any air from the system.
• Check all connections for leaks and rectify as necessary.
DO NOT SWITCH ON ANY OF THE HEAT SOURCES UNTIL THE UNIT HAS BEEN FULLY FILLED WITH WATER.
6.2 Direct Units
When the system is full switch on the electrical supply to the immersion heater(s) and allow the unit to heat up. Check
that the thermostat operates correctly. A preset storage temperature of approx. 60oC is recommended. If necessary the
temperature can be adjusted by inserting a flat bladed screwdriver in the adjustment knob and rotating. The minimum
thermostat setting is 10°C. Adjustment represents a temperature range of 10°C to 72°C (see Fig. 04, page 9).
6.3 Indirect Units
Fill the primary circuit following the boiler manufacturer’s commissioning instructions. To ensure the primary heating
coil in the Megalife is filled any motorised valve fitted to control the primary flow to the Megalife primary heating
coil should be manually opened by moving the lever on the motor housing to the MAN OPEN setting. When the
primary circuit is full return the lever to the AUTO position. Vent any air by opening the air bleed.
When the system is full switch on the boiler, ensure the programmer is set to Domestic Hot Water. Allow the Megalife
unit to heat up and check that the indirect thermostat and any motorised valve connected operate correctly. A preset
storage temperature of approx. 60oC is recommended. If necessary the temperature can be adjusted by inserting
a flat bladed screwdriver in the adjustment spindle on the immersion heater thermostat and rotating. Adjustment
represents a temperature range of 10°C to 72°C (see Fig. 04, page 9).
6.4 Benchmark Commissioning Certificate
On completion of installation and commissioning the Benchmark “Vented Cylinder Commissioning Certificate” should
be completed and signed off by the competent installer or commissioning engineer in the relevant sections.
6: Installation - Commissioning
Fig: 07. Secondary Circulation Connection

12
7.1 Temperature Control
Immersion Heaters
A combined thermostat and thermal cut-out is provided for each immersion heater. The thermostat is factory set
to give a water storage temperature of approx. 60oC, however it can be set to control between 10oC and 72oC. This
will usually have been done during installation. Adjustments can only be made by opening the terminal cover(s),
DO NOT remove the cover(s) without first switching off the electrical supply. The temperature adjustment is
made by inserting a flat bladed screwdriver in the slot in the spindle on top of the thermostat and rotating (see Fig.
04 page 9).
If in any doubt consult a competent electrician.
Primary Heating Coil
Indirect units are fitted with an indirect thermostat which controls a 2-port motorised valve, hence the temperature
of the water in the Megalife unit when heated using the auxiliary heating coil. The thermostat is factory set to give
a water storage temperature of approx. 60oC, however it can be set to control between 10oC and 72oC, this will
usually have been done during installation. Adjustments can only be made by opening the terminal cover. DO NOT
remove the cover without first switching off the electrical supply. Temperature adjustment is made by inserting
a flat bladed screwdriver in the adjustment spindle located on the front of the thermostat mounting bracket (see
Fig. 04, page 9) and rotating.
If in any doubt consult a competent electrician.
DO NOT bypass the thermal cut-out in any circumstances.
7.2 Flow Performance
As with any cistern fed vented system the pressure obtained at the outlet points is due to the height (head) of the
cold water fed cistern above the outlet. Outlet points with a low head may give lower flow rates than those located at
a lower level within the property. When several hot outlets are opened simultaneously some loss of flow from outlets
with a low head or located some distance from the Megalife may occur. This is a function of the system design and
does not necessarily indicate a fault with the water heater.
7: Installation - User Instructions

13
8.1 Maintenance Requirements
The Megalife has been designed and manufactured to require very little maintenance. However, to ensure the
continued optimum performance of the Megalife it should be periodically maintained. This is of particular importance
in hard water areas where limescale can build up on hot surfaces and eventually affect the heating efficiency of either
the immersion heater(s) or primary heating coil. Maintenance should be carried out by a competent person and any
replacement parts used should be authorised Heatrae Sadia Megalife spare parts.
In hard water areas consideration should be given to periodically descaling the immersion heater elements. To do this
the Megalife unit will need to be drained, 8.2 and 8.3 below detail how to drain the unit and remove the immersion
heater(s).
8.2 Draining The Megalife Unit
Switch off the electrical supply to the immersion heater(s), shut down the boiler on indirect units. Turn off the cold
water supply to the Megalife unit by shutting the service valve in the cold water feed pipe from the feed cistern.
Attach a hosepipe to the drain cock having sufficient length to take water to a suitable discharge point below the
level of the unit, at least one metre below the unit is recommended. Open drain cock.
8.3 Descaling Immersion Heater(s)
Open the cover(s) to the immersion heater housing(s) and disconnect wiring from immersion heater(s) thermostat(s).
Remove terminal shroud. Remove thermostat capillary sensors from the pockets on the immersion heater. Unscrew
immersion heater backnut(s) and remove immersion heater from the unit. A key spanner is supplied with the cylinder
unit for easy removal/tightening of the immersion heater(s). Over time the immersion heater gasket may become
stuck to the mating surface. To break the seal insert a round bladed screwdriver into one of the pockets on the
immersion heater and gently lever up and down.
Carefully remove any scale from the surface of the element(s). DO NOT use a sharp implement as damage to the
element surface could be caused. Ensure sealing surfaces are clean and seals are undamaged, if in doubt fit a new
gasket (part number 95 611 822).
Replace immersion heater(s) ensuring the lower (right angled) element hangs vertically downwards towards the base
of the unit. It may be helpful to support the immersion heater using a round bladed screwdriver inserted into one of
the thermostat pockets whilst the backnut is tightened. Replace the terminal shroud. Replace thermostat capillaries
into pocket taking care to put the curly tail capillary in first.
Rewire the immersion heater(s) in accordance with Fig. 04, page 9. Check, close and secure terminal cover.
8.4 Refilling System
DO NOT switch on the immersion heater(s) or primary boiler circuit until the system has been completely
refilled.
Close the drain tap. With the highest hot tap in the system open, turn on the service valve in the cold water feed pipe.
When water emits from the hot tap allow to flow for a short while to purge air and to flush through any disturbed
particles. Close hot tap and then open successive hot taps in system to purge any air. The electrical supply can now
be switched on.
8: Installation - Maintenance

14
9.1 Important
i) Servicing should only be carried out by competent installers in the installation and maintenance of water
heating syatems.
ii) Any spare parts used MUST be authorised Heatrae Sadia parts.
iii) Disconnect the electrical supply before removing any electrical equipment covers.
iv) NEVER bypass any thermal controls or operate system without the necessary safety controls.
v) Water contained in the Megalife unit may be very hot, especially following a thermal control failure.
Caution must be taken when drawing water from the unit.
9.2 Spare Parts
A full range of spare parts are available for the Megalife range. Refer to the technical data label on the unit to identify
the model installed and ensure the correct part is ordered.
9: Fault Finding and Servicing
31410
7
56
12
4
11
10
2
34
5
8
10
12
Fig: 08. Spares
Item Description Part Number
1 Immersion heater (lower) 95 606 984
2 Immersion heater (upper) 95 606 986
3 Immersion heater gasket 95 611 822
4 Immersion heater backnut 95 607 869
5
Direct combined thermostat
and thermal cut-out (spade
terminals including wires and
terminal block).
Direct combined thermostat
and thermal cut-out (spade
terminals NO wires or termi-
nal block).
95 612 720
95 612 721
6
Indirect combined thermostat
and thermal cut-out (spade
terminals including wires and
terminal block).
Indirect combined thermostat
and thermal cut-out (spade
terminals NO wires or termi-
nal block).
95 612 719
95 612 722
Table 01: Spares
Item Description Part Number
7 6 way terminal block 95 607 933
8 3 way terminal block 95 607 932
9 Immersion heater key 95 607 861
10 Terminal cover 95 614 305
11 Blanking plate assembly 95 605 881
12 Terminal Shroud 95 606 993
13 Set of compression nuts, olives 95 607 838

15
9.3 Fault Finding
The Fault Finding chart below will enable operational faults to be identified and their possible causes rectified. Any
work carried out on the Megalife water heater and its associated controls MUST be carried out by a competent installer
for water heating systems. In case of doubt contact the Heatrae Sadia Service Department (see back page).
FAULT POSSIBLE CAUSE REMEDY
No hot water flow 1. No water in cold feed
cistern
2. Service valve in cold water
feed pipe from cistern turned
off
3. Air lock in system
4. Inadequate head between
outlet and cold water feed
cistern
1. Check water supply to cold
feed cistern
2. Turn on service valve
3. Check pipework layout for
possible air locking points,
rectify as necessary
4. Check minimum head
requirement of outlet fitting
Hot water flow gradually
decreases
1. Outlet flow rate exceeds
inlet flow to cold water feed
cistern
2. Flow starvation caused by
opening further outlets
1. Install higher flow float
valve. Consider larger cold
water cistern storage capacity
2. Check pipe sizings and
layout. Consider restricting
flow rate through lower taps
Water from taps is cold 1. DIRECT immersion heater
is not switched on
2. DIRECT immersion heater
thermal cut-out has operated
3. INDIRECT programmer set
to central heating only
4. INDIRECT boiler not
working
5. INDIRECT thermal cut-out
has operated
6. INDIRECT motorised valve
not connected correctly
1. Check and switch on
2. Check, reset by pushing
button (see Fig 4, page 9)
3. Check, set to a domestic
hot water programme
4. Check boiler operation. If
fault is suspected consult
boiler manufacturer’s
instructions
5. Check, reset by pushing
button on cut-out. Check
operation of indirect
thermostat
6. Check wiring and/or
plumbing connections to
motorised valve (see figs 5
& 6, page 10)
Table 02: Fault Finding

16
10: Dimensions and Specifications
Fig: 09. Dimensions
315
A
354 - Indirect
B
Hot Outlet
Cold Inlet
Primary Return
Primary Flow
25°
45°
30°
45°
592
Ø
550
306 - Direct
Notes:
1. Indirect cylinders tested in conformance with BS EN 12897:2006
2. Heat up time from cold through 45°C, with a primary ow rate 15ltrs/min at 80°C +/- 2°C.
3. Direct heating times assume use of lower element only, from cold, through 45°C.
Table 03: Dimensions
Type Model
Reference
Dimensions (mm) Primary Flow
(ltrs/min @80°C
+/- 2°C)
Coil Rating
(kW)
Heat-up
Time (mins)
Hot Water
Capacity (ltrs)
(volume of water
drawn off >40°C)
A B
Indirect 100 B 813 500 15 15.4 19 97
120 B 930 617 15 18.3 21 108
150 B 1114 800 15 17.7 24 135
170 B 1240 927 15 18.7 26 157
210 B 1498 1185 15 24.5 25 199
Direct 100 E 807 494 97 97
120 E 930 616 116 108
150 E 1114 800 148 135
170 E 1240 926 164 157
210 E 1498 1185 203 199

17
Table 05 - Standing Heat Loss
Standing heat losses (based on an ambient air temperature of 20°C and a stored water temperature of 65°C)
Nominal
Capacity
(Litres)
Standing Heat Loss
per day
(kWh/24h)
per year
(kWh/365d)
100 1.14 416
120 1.25 456
150 1.45 529
170 1.63 595
210 1.91 697
Table 04: Unit weights
Type Model
Reference
Nominal
Capacity
(litres)
Weight of
unit full
(Kg)
Weight
of unit
(Kg)
Indirect 100 B 100 125 25
120 B 120 147 27
150 B 150 181 31
170 B 170 204 34
210 B 210 257 47
Direct 100 E 100 124 24
120 E 120 146 26
150 E 150 179 29
170 E 170 201 31
210 E 210 252 42
Model(s) 100B 120B 150B 170B 210B
Energy efficiency class B B C C C
Storage volumes V in Litres 100.0 125.0 150.0 170.0 210.0
Standing loss in W 48.0 52.0 60.0 68.0 80.0
Name Megalife
Model 100E 120E 150E 170E 210E
Volume Litres 100.0 120.0 150.0 170.0 210.0
V40 143 180 234 265 332
Load Profile M M L L XL
Energy Efficiency Class C C C C C
Energy Efficiency % 36.2 36.0 37.3 37.1 38.1
Annual electricity consumption kWh 1418 1424 2741 2759 4395
Daily fuel consumption kWh 6.640 6.680 12.730 12.840 20.300
Thermostat setting 60°C
Specific precautions that shall be taken when the
water heater is assembled, installed or maintained and
disposed of at end of life
See Section 2 to 10
Table 7: Technical parameters in accordance with European Commission regulations 814/2013 and 812/2013
Table 7: Technical parameters in accordance with European Commission regulations 814/2013 and 812/2013

18
Outline Specifications
Maximum working head 40 metres (4 bar)
Immersion heater rating (a.c. supply only) 3kW @ 240V ~ 50Hz
2.8kW @ 230V ~ 50Hz
Maximum primary circuit pressure 0.3MPa (3 bar)
Rated pressure 0.2MPa (2.0 bar)
Pressure drop across coils 0.02MPa(0.2bar)
Outer casing:
White textured plastic coated corrosion proofed steel
Water container:
Duplex stainless steel (grade 1.4362 to EN10088). 100% pressure tested to 15 bar.
Thermal insulation:
HCFC/CFC free (ODP Zero) fire retardant expanded polyurethane foam. Nominal thickness 50mm.
Immersion heater:
Alloy 825 sheathed element and thermostat pocket in Duplex stainless steel plate. Tin plated.
Pipe connections:
All connections accept 22mm outside diameter pipe - compression nuts and olives supplied. Thread rate is 3/4” BSP
male parallel to accept standard 3/4” BSP female fittings if required. Secondary return tapping thread rate is 1/2” BSP
female parallel to accept standard 1/2”BSP male fittings if required (supplied plugged).
Safety features:
Direct units -
Manually resettable thermal cut-out on each heating element thermostat.
Indirect units -
Manually resettable thermal cut-out on heating element thermostat.
Manually resettable thermal cut-out for primary heating. Must be wired in conjunction with a suitable motorised
valve located within the primary heating circuit (not supplied).

19
Goods are guaranteed and sold subject to our standard conditions of sale. A copy of these conditions will be supplied
on application.
11.1 Guarantee Terms
Heatrae Sadia guarantee the Megalife immersion heater for a period of two years from the date of purchase, with
the exception of damage due to scaling.
Electrical parts and thermal controls are guaranteed for a period of two years, from the date of purchase.
The stainless steel vessel is guaranteed for a period of 25 years against faulty manufacture or materials provided
that :-
i) It has been installed by a competent installer and as per the instructions contained in this manual and all relevant
Codes of Practice and Regulations in force at the time of installation.
ii) It has not been modified in any way other than by Heatrae Sadia Heating.
iii) It has only been used for the storage of potable water.
iv) It has not been installed in a location liable to be subjected to frost, nor has it been tampered with or been
subjected to misuse or neglect.
v) No factory fitted parts have been removed for unauthorised repair or replacement.
vi) Within 60 days of purchase the user completes and returns the certificate supplied along with proof of purchase
to register the product.
Evidence of purchase and date of supply must be submitted.
This guarantee is not valid for installations outside the United Kingdom and the Republic of Ireland. For installations
outside these territories please contact either the Heatrae Sadia Heating Export Department (Tel: [phone])
or Baxi International (Tel: [phone]) for further details of the guarantee terms and conditions applicable.
This guarantee does not affect your statutory rights.
Environmental Information
This product is made from many recyclable materials, therefore at the end of its useful life it should be disposed of
at a Local Authority Recycling Centre in order to realise the full environmental benefits.
Insulation is by means of an approved HCFC and CFC free polyurethane foam.
The pace of product development is such that we reserve the right to change product specifications without notice.
We do, however, strive to ensure that all information in this leaflet is accurate at the time of publication
11: Guarantee

Heatrae Sadia, Hurricane Way, Norwich,
Norfolk, NR6 6EA, United Kingdom
After Sales Service
T: 0344 871 1535
E: [email protected]
www.heatraesadia.com
SPARES STOCKISTS:
Advanced Water Company Ltd
Unit D5 Enterprise Way
Vale Park, Evesham
Worcs, WR11 1GS
T: 01386 760066
F: 01386 760077
Electric Water Heating Co
2 Horsecroft Place, Pinnacles,
Harlow, Essex, CM19 5BT
T: 0845 055 3811
E: [email protected]
SPD
Units 9 & 10 Hexagon Business Centre
Springeld Road, Hayes,
Middlesex, UB4 0TY
T: 020 8606 3567
Parts Center
T: 0845 270 9800
W: www.partscenter.co.uk
Newey & Eyre
Unit 3/4/5 Wassage Way
Hampton Lovett Industrial Estate
Droitwich, Worcestershire, WR9 0NX
T: 01905 791500
F: 01905 791501
UK Spares Ltd
Unit 1155, Aztec West,
Almondsbury, Bristol, BS32 4TF
T: 01454 620500
Alternatively contact your local supplying
merchant or wholesale branch.
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