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19 19 Boiler model Unit 147/ 147H 147/ 294V 147/ 441V 196/ 196H 196/ 392V 196/ 588V 254/ 254H 254/ 508V 254/ 762V Number of modules 1 2 3 1 2 3 1 2 3 Energy Building regulations Part L seasonal efficiency % 94.8 94.8 94.8 93.9 93.9 93.9 95.0 95.0 95.0 BS EN 15502 seasonal efficiency 95.2 95.2 95.2 94.1 94.1 94.1 95.3 95.3 95.3 Boiler output 50/30 °C kW 147.4 294.8 442.2 196.3 392.6 588.9 254.4 508.7 763.1 Boiler output 80/60 °C kW 142.8 285.6 428.4 191.6 383.2 574.8 239.8 479.6 719.4 Boiler input (gross) maximum kW 163.0 326.0 489.0 219.0 428.7 657.0 275.0 550.0 825.0 Boiler input (nett) maximum kW 146.8 293.6 440.3 197.2 394.4 591.6 247.6 495.3 742.9 Boiler output minimum 80/60 °C kW 28.7 28.7 28.7 38.6 38.6 38.6 48.4 48.4 48.4 Water Design flow rate @ 40°C ∆ T rise l/s 0.9 1.8 2.7 1.2 2.4 3.6 1.5 3.0 4.5 Water side pressure loss @ 40°C ∆ T rise mbar 36 36 36 62 62 62 100 100 100 Design flow rate @ 30°C ∆ T rise l/s 1.2 2.4 3.6 1.6 3.2 4.8 2.0 4.0 6.0 Water side pressure loss @ 30°C ∆ T rise mbar 60 60 60 120 120 120 180 180 180 Design flow rate @ 20°C ∆ T rise l/s 1.8 3.6 5.4 2.4 4.8 7.2 3.0 6.0 9.0 Water side pressure loss @ 20°C ∆ T rise mbar 145 145 145 246 246 246 395 395 395 Design flow rate @ 11°C ∆ T rise l/s 3.3 6.6 9.9 4.3 8.6 12.9 5.4 10.8 16.2 Water side pressure loss @ 11°C ∆ T rise mbar 500 500 500 850 850 850 1300 1300 1300 Operating water pressure minimum barg Dependent on differential temperature (See full brochure) Operating water pressure maximum barg 10 10 10 10 10 10 10 10 10 Maximum operating water temperature °C 90 90 90 90 90 90 90 90 90 Gas Gas flow rate natural gas (G20) - maximum m 3 /h 16.0 32.0 48.0 21.4 42.8 64.2 27.9 55.8 83.7 Gas inlet pressure natural gas (G20) - minimum/nominal/maximum mbar 17.5 min / 20.0 nom / 25.0 max Flue Approx. flue gas volume @ 15°C, 9.3-9.8% C0 2 m 3 /h 214 428 642 279 558 837 354 708 1062 Flue gas temperature @80/60 °C °C 78 78 78 83 83 83 82 82 82 NO x emission (0% excess oxygen, dry air free) European Class 6 mg/kWh 37.7 37.7 37.7 39.9 39.9 39.9 38.8 38.8 38.8 Pressure at flue outlet Pa 89 89 89 90 90 90 150 150 150 Misc. Nominal supply voltage 230V 1Ph 50Hz Approx. shipping weight kg 226 452 678 226 452 678 226 452 678 Noise emissions/module @ 1m @max. modulation Max dB (A) 65 65 65 65 65 65 65 65 65 Technical data - 147-254kWmodels 01202 662500 | sales@hamworthy-heating.com | hamworthy-heating.com Boilers Technical Data: Wessex ModuMax mk3  The challenge: St Paul’s Cathedral is a listed building which is subject to strict regulations, prohibiting alterations without special permissions. Leaking steel shell boilers from the 1960s needed replacement. The cathedral considered replacing them with the same kind, but this was not possible due to current legislation to eliminate inefficient boilers. The solution: Hamworthy provided a flexible and efficient modular boiler and hot water solution to fit the building. Two Wessex ModuMax mk3 WM254/508V modular condensing boilers with a combined output of 1,016kW were chosen. Backed up by a 10-year warranty and fitting through a standard doorway, they provided the installation flexibility needed for St Paul’s Cathedral. To meet the hot water requirements, especially during the summer months’ peak demand when tourist groups arrive, two Powerstock PS500 glass-lined calorifiers with a capacity of 500 litres each and quick recovery time of 18 minutes were chosen. Robin Bunton, who chose and installed boilers and water heaters comments: “We have used the Wessex boilers since they were introduced and know they are a very reliable product. They are space saving, great in refurbishment projects and buildings where you can’t change the building fabric, such as St Paul’s. The speed of heat up has greatly improved. Previously it would take a week to heat the cathedral up from cold, but now it only takes one day.“ Ticking the boxes of a successful project The challenge to provide an energy efficient and compact heating solution to be fitted to an old heating system without changing St Paul’s Cathedral’s building structure was successfully met. Space restrictions were overcome by choosing a modular boiler system to allow installation flexibility and access. ‰‰ Grade 1 listed building refurbishment ‰‰ 40% reduction in gas consumption Project ‰‰ Wessex ModuMax mk3 boilers ‰‰ Powerstock calorifiers Products Case study St Paul’s Cathedral, London

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