Hot Water
Energy
Storage
Unvented Cylinder
Installation & Maintenance Instructions for an unvented
hot water cylinder with internal thermal expansion
SEPT 2018
10
DIRECT CYLINDERS
INDIRECT CYLINDERS
Boss centre from floor
Capacity
(Ltrs)
Height
(mm)
Dia.
(mm)
A
(mm)
B
(mm)
C1
(mm)
C2
(mm)
E
(mm)
F
*
(mm)
125
1001
580
183
650
243
531
618
NF
153
1187
580
183
836
243
631
804
NF
180
1371
580
183
1020
243
731
988
NF
207
1561
580
183
1086
243
831
1054
1021
243
1806
580
183
1331
243
971
1299
1266
297
2076
580
183
1583
243
1122
1551
1518
* Not always fitted refer to table above
Thermostat set at 55ºC
Always isolate from electric supply before working on product
B
F
C1
C2
A
E
Connections:
A
22mm Cold feed with dip pipe to
diffuser in bottom of cylinder
B
22mm Hot water outlet
C1
Immersion heater
C2
Secondary immersion heater
E
Temperature relief valve boss
(Valve factory fitted to cylinder)
F
*
22mm Secondary return
Connections:
A
22mm Cold feed with dip pipe to
diffuser in bottom of cylinder
B
22mm Hot water outlet
C1
†
Immersion heater
C2
*
Secondary immersion heater
D
22mm Coil connections
E
1
/
2
” Temperature relief valve boss
(Valve factory fitted to cylinder)
F
*
22mm Secondary return
B
F
D
C2
C1
D
A
E
Boss centre from floor
Capacity
(Ltrs)
Height
(mm)
Dia.
(mm)
A
(mm)
B
(mm)
C1
†
(mm)
C2
*
(mm)
D
(mm)
E
(mm)
F
*
(mm)
119
1001
580
459
655
359
NF
319
623
NF
149
1187
580
459
851
389
NF
349
809
NF
178
1371
580
494
1025
419
NF
379
993
NF
205
1561
580
494
1091
419
NF
379
1059
1026
242
1806
580
534
1336
454
1109
414
1304
1271
285
2076
580
534
1588
454
1259
414
1556
1523
* Not always fitted refer to table above
† Not to be used as the primary heat source