Hot water cylinders
Hot water cylinder standard sizes
| Standard Cylinders | |||||
|---|---|---|---|---|---|
| British standard |
External diameter of cylinder (excluding insulation) |
External height over dome |
Min storage capacity | Expected port fittings | |
| Direct | Indirect | ||||
| mm | mm | Litres | Litres | female, BSP | |
| 0 | 300 | 1600 | 98 | 96 | 1" |
| 1 | 350 | 900 | 74 | 72 | 1" |
| 2 | 400 | 900 | 98 | 96 | 1" |
| 3 | 400 | 1050 | 116 | 114 | 1" |
| 4 | 450 | 675 | 86 | 84 | 1" |
| 5 | 450 | 750 | 98 | 95 | 1" |
| 6 | 450 | 825 | 109 | 106 | 1" |
| 7 | 450 | 900 | 120 | 117 | 1" |
| 8 | 450 | 1050 | 144 | 140 | 1 1/4" |
| 9 | 450 | 1200 | 166 | 162 | 1 1/4" |
| 9e | 450 | 1500 | 210 | 206 | 1 1/4" |
| 10 | 500 | 1200 | 200 | 190 | 1 1/2" |
| 11 | 500 | 1500 | 255 | 245 | 1 1/2" |
| 12 | 600 | 1200 | 290 | 280 | 2" |
| 13 | 600 | 1500 | 370 | 360 | 2" |
| 14 | 600 | 1800 | 450 | 440 | 2" |
