Varmax floor standing boiler

Floor standing, high output condensing boiler with a stainless steel heat exchanger.
The range consists of 10 single boilers with outputs (at 50/30°C) of 127, 148, 191, 238, 290, 338, 415, 478, 558, 637kW.

Product information

Improved efficiency on split temperature systems due to high and low temperature return connections.
Non-dependent on system flow allowing wide differential temperatures.
Easier installation with no requirement for dedicated primary circuit and no minimum flow rates.
Tolerant to a wide range of system water conditions with a corrosion resistant stainless steel heat exchanger.
Long life backed up by a 5-year heat exchanger warranty.
Well insulated for low standby losses.
NOx emissions comply with ErP legislation lower than 56mg/kWh.
Match heating system loads accurately with outputs up to 637kW from a single boiler and ability to cascade multiple boilers.
Simplified flue system design as the flue gas non-return valve is built in to provide effective protection from re-circulation of flue gases through non-firing boilers.
Built in boiler sequence controls capable of controlling up to 16 boiler modules, multiple heating circuits and a hot water circuit using the master/slave principle.
Quick release access panels for ease of service and maintenance.
BIM objects available to assist in design and management.

Split temperature systems such as a combination of radiator loops/air convectors and underfloor heating.
Medium to large sized district heating schemes.
Schools.
Shopping centres.
Offices.
Sports facilities.
Health facilities.

Single Boiler Controls

Outside air temperature sensor QAC34 (Part no. 533901457)
Domestic Hot Water sensor kit (sensor and pocket) QAZ36 (Part no. 563605674)
Mixing valve heating circuit control kit (AVS 75 control module, temperature sensor and pocket) for 1 zone (Part no. 059751)
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)
Heating circuit sensor kit (sensor and pocket) QAZ36 (Part no. 563605673)
Merley boiler sequence controller, wall mounted (Part no. 563605672)
LPB Bus communication module OCI345, one required per boiler module (Part no. 563605667)
Programmable room sensor QAA75 (Part no. 533901587)
Offset adjustable room sensor QAA55 (Part no. 533901589)
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.

Energy

	Units	120	140	180	225	275	320	390	450	525	600
Building regulations Part L seasonal efficiency	% gross	96.13	96.13	96.33	96.33	96.24	96.24	96.22	96.22	96.22	96.22
Boiler output - maximum 80/60°C, NG & LPG*	kW	117	136	175	219	268	312	381	439	513	586
Boiler output - maximum 50/30°C, NG & LPG*	kW	127	148	191	238	290	338	415	478	558	637
Boiler output - minimum 80/60°C, Nat Gas.	kW	27.3	27.2	41.8	41.8	64.3	64.3	85	84.7	118	118
Boiler output - minimum 80/60°C, LPG	kW	38	37.8	61.3	61.3	87.6	87.7	N/A	N/A	N/A	N/A
Boiler input (gross) - maximum, NG & LPG*	kW	120	140	180	225	275	320	390	450	525	600
Boiler input (net) - maximum, NG & LPG*	kW	108	126	162	203	248	288	351	405	473	541
Standby loss	W	182	182	213	213	259	259	311	311	461	461

Water

	Units	120	140	180	225	275	320	390	450	525	600
Water content	litres	116	116	151	151	239	239	287	287	420	420
System design flow rate @ 30°C ΔT rise	l/s	0.9	1.1	1.4	1.7	2.1	2.5	3	3.5	4.08	4.69
Water side pressure loss @ 30°C ΔT rise	mbar	27	33	25	36	36	53	34	43	60	75
System design flow rate @ 20°C ΔT rise	l/s	1.4	1.6	2.1	2.6	3.2	3.7	4.6	5.3	6.14	7
Water side pressure loss @ 20°C ΔT rise	mbar	60	75	57	81	82	119	77	97	86	107
System design flow rate @ 11°C ΔT rise	l/s	2.5	2.9	3.8	4.7	5.8	6.8	8.3	9.5	11.17	12.77
Water side pressure loss @ 11°C ΔT rise	mbar	198	248	188	268	271	393	255	321	335	450
Minimum water pressure	barg	1	1	1	1	1	1	1	1	1	1
Maximum water pressure	barg	6	6	6	6	6	6	6	6	6	6
Minimum flow temperature setting	°C	22	22	24	24	20	20	23	23	22	22
Maximum flow temperature setting	°C	85	85	85	85	85	85	85	85	85	85

Gas

	Units	120	140	180	225	275	320	390	450	525	600
Gas flow rate, NG (G20) - maximum	m³/hr	12.7	14.8	19.1	23.8	29.1	33.9	41.3	47.6	55.6	63.5
Maximum gas inlet pressure, Nat Gas	mbar	25	25	25	25	25	25	25	25	25	25
Nominal inlet pressure, Nat Gas	mbar	20	20	20	20	20	20	20	20	20	20
Minimum gas inlet pressure, Nat Gas	mbar	17	17	17	17	17	17	17	17	17	17
Gas flow rate, LPG (G31) - maximum	m³/hr	4.9	5.7	7.4	9.2	11.3	13.1	N/A	N/A	N/A	N/A
Nominal inlet pressure, LPG	mbar	37	37	37	37	37	37	N/A	N/A	N/A	N/A

Flue

	Units	120	140	180	225	275	320	390	450	525	600
Maximum flue gas temperature @ 80/60°C Nat Gas	°C	60.8	62.1	61	62.3	61.7	63.4	62.5	64.8	64.4	66.6
Pressure at boiler flue spigot @ 80/60°C Nat Gas B23P	Pa	200	200	115	165	122	176	180	193	160	200
Maximum flue gas temperature @ 80/60°C LPG	°C	60.3	62.6	60.3	62.2	63	65.4	N/A	N/A	N/A	N/A
Pressure at boiler flue spigot @ 80/60°C LPG B23P	Pa	167	200	103	136	118	157	N/A	N/A	N/A	N/A
Dry NOx emission**	mg/kWh	30	30	30	30	40	40	35	35	55	55
NOx Class		6	6	6	6	6	6	6	6	6	6

Electrical

	Units	120	140	180	225	275	320	390	450	525	600
Electrical supply		230V, 1Ph, 50Hz	230V, 1Ph, 50Hz	230V, 1Ph, 50Hz	230V, 1Ph, 50Hz	230V, 1Ph, 50Hz	230V, 1Ph, 50Hz	230V, 1Ph, 50Hz	230V, 1Ph, 50Hz	230V, 1Ph, 50Hz	230V, 1Ph, 50Hz
Power consumption - maximum boiler modulation	W	204	311	179	320	238	352	480	660	697	960
Start current (per module)	Amp	3.5	5.4	3.1	5.6	4.1	6.1	8.3	11.5	11.9	16.3
Run current (per module)	Amp	0.89	1.35	0.78	1.39	1.03	1.53	2.09	2.87	3	4.17
Approx shipping weight	kg	340	340	393	393	502	502	592	592	800	800
Noise emission @1m: @max. modulation	dB (A)	65	65	61	61	61	61	68	68	68	68

*390kW, 450kW, 525kW and 600kW models Nat Gas only

**(0% excess oxygen, mg/kWh dry air free); NG/LPG