ModuMax mk3 floor standing boiler

Stainless steel high efficiency, fully modulating condensing pre-mix floor standing boiler.
Available in 5 modules with outputs (@80/60°C) of 97, 116, 147, 196 and 254kW. Individual boiler modules can be stacked one, two or three high in 15 combinations up to 762kW output.

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St-Pauls-Cathedral-wessex-modumax-mk3-boiler

Product information

Fully modulating boiler which benefits from lower fuel usage and closer load matching.
Space-saving stacked modular boiler delivering 762kW in less than a square metre footprint.
Flexibility in system design with differential temperature (delta T) up to 40°C. Suited to district heating schemes, the lower flow rates associated with wider differential temperature allow smaller diameter pipes and smaller pumps that can lower capital cost and also reduce energy consumption.
Compensate for distribution losses in large heating systems with max 90°C flow temperature.
10 bar maximum working pressure allows installation in basement for high rise buildings.
Stainless steel heat exchanger backed up by with a 10-year warranty, making the Wessex ModuMax mk3 an extremely robust boiler.
High relative velocity within the waterways help to reduce the opportunity for sedimentation.
Low water content, rapid response, with minimal standing losses.
Built in boiler sequence controls capable of controlling up to 16 boiler modules and hot water circuits.
Low environmental impact - NOx <40mg/kWh for maximum BREEAM credits.
Easy access to plant room as the lightweight and compact Wessex ModuMax mk3 fits through a standard doorway and can split into modules for limited access or rooftop plant rooms, as well as packaged plant rooms.
Buy in confidence from a UK manufacturer with decades of commercial heating and hot water expertise.
Back up and support from our team of experienced engineers across the UK.
Extensive boiler spare parts service available direct from the manufacturer.
BIM objects available to assist in design and management.

Ideal uses/applications

Hybrid systems alongside combined heat and power (CHP) and/or other low carbon technologies such as our commercial monobloc air source heat pumps.
Energy centres within district heating schemes and larger premises.
Housing developments and flats using district heating network.
Easy fit replacement for refurbishment projects.
Roof top and basement plantrooms.
Packaged plantrooms.
New build projects.
Large commercial and public buildings including schools, hospitals and hotels.
Medium sized commercial and public buildings including schools, hospitals, offices and hotels.
Small industrial and manufacturing premises.
Locations with substantial and continuous heating load including hospitals, care homes and hotels.

Optional extras

Pipework kits to match the boiler model for ease of installation on site.
Flues available
Choose from a wide range of service contracts to help maintain optimum performance.
Book commissioning at the same time as placing your order for improved warranty terms.

Single Boiler Controls

Outside air temperature sensor QAC34 (Part no. 533901457).
Domestic Hot Water sensor kit (sensor and pocket) (Part no. 563605674).
Mixing valve heating circuit control kit (clip in control module, temperature sensor and pocket) for 1 zone (Part no. 563605668).
Mixing valve heating circuit control kit (clip in control module, temperature sensor and pocket) for 2 zones (Part no. 563605669).
Mixing valve heating circuit control kit (clip in control module, temperature sensor and pocket) for 3 zones – Note: cannot be used in conjunction with volt free contact kit (Part no. 563605670).
Programmable room sensor QAA75 (Part no. 533901587).
Offset adjustable room sensor QAA55 (Part no. 533901589).

Multiple Boiler Controls

Outside air temperature sensor QAC34 (Part no. 533901457).
Volt free contact kit for remote status signalling AGU2.550A109 (Part no. 563605666).
Heating circuit sensor kit (sensor and pocket) QAZ36 (Part no. 563605673).
Merley boiler sequence controller, wall mounted (Part no. 563605672).
Merley boiler sequence controller, loose kit for panel mounting (Part no. 563605671).
LPB Bus communication module OCI345, one required per boiler module (Part no. 563605667).
Programmable room sensor QAA75 (Part no. 533901587).

ModuMax mk3 commercial boiler
Units
97/97H
97/194V
97/291V
116/116H
116/232V
116/348V
147/147H
147/294V
147/441V
196/196H
196/392V
196/588V
254/254H
254/508V
254/762V
No. of modules
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3

	Units	97/97H	97/194V	97/291V	116/116H	116/232V	116/348V	147/147H	147/294V	147/441V	196/196H	196/392V	196/588V	254/254H	254/508V	254/762V
No. of modules		1	2	3	1	2	3	1	2	3	1	2	3	1	2	3

Energy

	Units	97/97H	97/194V	97/291V	116/116H	116/232V	116/348V	147/147H	147/294V	147/441V	196/196H	196/392V	196/588V	254/254H	254/508V	254/762V
Building regulations Part L seasonal efficiency	% gross	94.9	94.9	94.9	93.1	93.1	93.1	94.8	94.8	94.8	93.9	93.9	93.9	95.0	95.0	95.0
BS EN 15502 seasonal efficiency	% gross	95.2	95.2	95.2	93.4	93.4	93.4	95.2	95.2	95.2	94.1	94.1	94.1	95.3	95.3	95.3
Boiler output 80/60°C, NG & LPG	kW	95.7	191.4	287.1	115.2	230.4	345.6	142.8	285.6	428.4	191.6	383.2	574.8	239.8	479.6	719.4
Boiler output 50/30°C, NG & LPG	kW	97.2	194.4	291.6	116.2	232.5	348.7	147.4	294.8	442.2	196.3	392.6	588.9	254.4	508.7	763.1
Boiler input (gross) - maximum, NG	kW	109	218	327	133	266	399	163	326	489	219	428.7	657	275	550	825
Boiler input (gross) - maximum, LPG	kW	106.7	213.4	320.1	130.2	260.4	390.5	159.5	319.1	478.6	214.4	428.7	643.1	269.2	538.3	807.5
Boiler input (net) - maximum, NG & LPG	kW	98.2	196.4	294.6	119.8	239.6	359.4	146.8	293.6	440.3	197.2	394.4	591.6	247.6	495.3	742.9
Boiler output - minimum 80/60°C, NG & LPG	kW	19.1	19.1	19.1	23.5	23.5	23.5	28.7	28.7	28.7	38.6	38.6	38.6	48.4	48.4	48.4

Water

	Units	97/97H	97/194V	97/291V	116/116H	116/232V	116/348V	147/147H	147/294V	147/441V	196/196H	196/392V	196/588V	254/254H	254/508V	254/762V
Water content	litres	16	32	48	16	32	48	22	44	66	22	44	66	22	44	66
System design flow rate @ 40°C ∆T rise	l/s	0.6	1.2	1.8	0.7	1.4	2.1	0.9	1.8	2.7	1.2	2.4	3.6	1.5	3	4.5
Water side pressure loss @ 40°C ∆T rise	mbar	5	5	5	7	7	7	36	36	36	62	62	62	100	100	100
System design flow rate @ 30°C ∆T rise	l/s	0.8	1.6	2.4	1	2	3	1.2	2.4	3.6	1.6	3.2	4.8	2	4	6
Water side pressure loss @ 30°C ∆T rise	mbar	9	9	9	14	14	14	60	60	60	120	120	120	180	180	180
System design flow rate @ 20°C ∆T rise	l/s	1.2	2.4	3.6	1.4	2.8	4.2	1.8	3.6	5.4	2.4	4.8	7.2	3	6	9
Water side pressure loss @ 20°C ∆T rise	mbar	20	20	20	27	27	27	145	145	145	246	246	246	395	395	395
System design flow rate @ 11°C ∆T rise	l/s	2.2	4.4	6.6	2.6	5.2	7.8	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	61	61	61	91	91	91	500	500	500	850	850	850	1300	1300	1300
Maximum water pressure	barg	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10
Maximum flow temperature setting	°C	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90

Gas

	Units	97/97H	97/194V	97/291V	116/116H	116/232V	116/348V	147/147H	147/294V	147/441V	196/196H	196/392V	196/588V	254/254H	254/508V	254/762V
Gas flow rate, NG (G20) - maximum	m3/hr	10.4	20.8	31.2	12.7	25.4	38.1	15.5	31	46.5	20.9	41.8	62.7	26.2	52.4	78.6
Gas flow rate, LPG (G31) - maximum	m3/hr	4	8	12	5	10	15	6	12	18	8.1	16.2	24.3	10.1	20.2	30.3
Nominal inlet pressure, NG (LPG) - maximum	mbar	20 (37)	20 (37)	20 (37)	20 (37)	20 (37)	20 (37)	20 (37)	20 (37)	20 (37)	20 (37)	20 (37)	20 (37)	20 (37)	20 (37)	20 (37)
Maximum gas inlet pressure NG (LPG)	mbar	25 (45)	25 (45)	25 (45)	25 (45)	25 (45)	25 (45)	25 (45)	25 (45)	25 (45)	25 (45)	25 (45)	25 (45)	25 (45)	25 (45)	25 (45)

Flue

	Units	97/97H	97/194V	97/291V	116/116H	116/232V	116/348V	147/147H	147/294V	147/441V	196/196H	196/392V	196/588V	254/254H	254/508V	254/762V
Approx. flue gas volume @ 15°C, 8.75-9.25% CO2	m³/hr	143	286	429	160	320	480	214	428	642	279	558	837	354	708	1062
Maximum flue gas temperature @ 80/60°C	°C	83	83	83	83	83	83	78	78	78	83	83	83	82	82	82
Pressure at boiler flue connection	Pa mbar	150 1.5	150 1.5	150 1.5	150 1.5	150 1.5	150 1.5	150 1.5	150 1.5	150 1.5	150 1.5	150 1.5	150 1.5	150 1.5	150 1.5	150 1.5
NOx emission (0% excess oxygen, dry air free) - NG	mg/kWh	39.8	39.8	39.8	34.3	34.3	34.3	37.7	37.7	37.7	39.9	39.9	39.9	38.8	38.8	38.8
NOx emission (0% excess oxygen, dry air free) - LPG	mg/kWh	42	42	42	57.3	57.3	57.3	69.3	69.3	69.3	68.6	68.6	68.6	39.9	39.9	39.9

Connection

	Units	97/97H	97/194V	97/291V	116/116H	116/232V	116/348V	147/147H	147/294V	147/441V	196/196H	196/392V	196/588V	254/254H	254/508V	254/762V
Water flow/return connections	inches	G1½" male	G1½" male	G1½" male	G1½" male	G1½" male	G1½" male	G2½" male	G2½" male	G2½" male	G2½" male	G2½" male	G2½" male	G2½" male	G2½" male	G2½" male
Gas inlet connection pipe thread size	inches	R1" male	R1" male	R1" male	R1" male	R1" male	R1" male	R1¼" male	R1¼" male	R1¼" male	R1¼" male	R1¼" male	R1¼" male	R1¼" male	R1¼" male	R1¼" male
Nominal flue diameter (I/D)	mm	100	180	180	100	180	180	150	250	250	150	250	250	150	250	250
Condensate trap connection(s) (O/D)	mm	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32

Electrics

	Units	97/97H	97/194V	97/291V	116/116H	116/232V	116/348V	147/147H	147/294V	147/441V	196/196H	196/392V	196/588V	254/254H	254/508V	254/762V
Electrical supply		230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz	230 V 1 Ph 50 Hz
Power consumption - maximum boiler modulation	W	166	332	498	166	332	498	240	480	720	240	480	720	240	480	720
Start current (per module)	Amp	1.2	1.2	1.2	1.2	1.2	1.2	1.3	1.3	1.3	1.3	1.3	1.3	1.3	1.3	1.3
Run current (per module)	Amp	0.72	0.72	0.72	0.72	0.72	0.72	1.05	1.05	1.05	1.05	1.05	1.05	1.05	1.05	1.05
Approx shipping weight	kg	180	355	540	180	355	540	226	452	678	226	452	678	226	452	678
Noise emission @1m @maximum modulation	Max dB (A)	60	60	60	60	60	60	65	65	65	65	65	65	65	65	65
Noise emission @1m @minimum modulation	Min dB (A)	47	47	47	47	47	47	47	47	47	47	47	47	47	47	47