Stratton mk3 wall hung boiler

Wall hung condensing boiler offering a small and durable solution suitable for even the tightest plant rooms.
Available in 7 models with outputs (at 50/30°C) of 40kW, 60kW, 70kW, 80kW, 100kW, 120kW, 150kW

Stratton mk3 System Selector

6d8882b1e844-Stratton-Mk3-RH-facing-single-pipe-kit 450x800

96e6901eef78-Stratton-Mk3-LH-facing-single 450x800

26999ec04737-Stratton-Mk3-front-facing-single 450x800

Product Information

A wide range of outputs enables you to specify the best wall hung boiler model for your commercial heating system
Single units can be cascaded for larger installations up to 900kW*
Particularly suited to low height plantrooms, the boiler is less than 2 metres from the ground to the top of the frame when mounted on our low height pipe kit.
Outstanding efficiency in excess of 108% nett keeps operating costs to a minimum
Accurate load matching with a high turndown ratio and fully modulating performance
Pre-mix burner technology gives clean operation with ErP Class 6 NOx emissions
Heat exchanger manufactured in corrosion resistant stainless steel for a long life, backed up by a 5-year heat exchanger warranty.
Built in boiler sequence controls capable of controlling up to 16 boiler modules and hot water circuits
Space saving flue arrangement above the boiler thanks to a concentric flue connector and integral flue gas non-return valve
Durable stainless steel heat exchanger, this boiler offers exceptional system tolerance
Full range of hydraulic separation options available
Easy access for service and system cleaning
Suitable for natural gas (all sizes) and LPG (up to 120kW) applications
Quick and easy to install with optional pipe kits for up to 6 boilers and wall mounting plate for individual boilers
Simple to move and store due to lightweight heat exchanger, and flat base of unit reduces risk of damaging connections
Suitable for use with room sealed or open flue systems giving you greater flexibility in siting the boilers
Simple to maintain using quick release internal water and gas couplings
A commercial boiler designed for sealed systems only for greater efficiency (you can read about the benefits of Sealed 'v' Open Vented heating systems here)
Low output models in the range for smaller applications

* when using 6 Stratton mk3 boilers of 150kW in a cascade of 6.

Ideal Uses/ Applications

New build and retrofit projects.
Smaller commercial and public buildings including community schools, care homes, hotels, churches and retail units.
Small industrial and manufacturing premises.

Optional Extras

A large range of off the shelf flue options available
Room sealed and open flue solutions
Choice of pipe kits (including pumps) with PHEX and low loss header (Want to know 'What is a low loss header?').
Support frame kit
Choice of controls

Energy

Energy	Units	S3-40	S3-60	S3-70	S3-80	S3-100	S3-120	S3-150
Building regulations Part L seasonal efficiency	% gross	95.7	95.5	95.6	95.6	95.6	95.6	95.8
ErP efficiency rating (modules ≤ 70 kW only)		A	A	A	N/A	N/A	N/A	N/A
Boiler output - maximum 80/60°C, NG & LPG	kW	38.8	53.4	67.8	77.8	93.4	116.8	141.1
Boiler output - maximum 50/30°C, NG & LPG	kW	42.2	58	73.6	84.4	101.3	127.8	154.5
Boiler output - minimum 80/60°C, NG & LPG	kW	8	11	14	19.2	19.2	24	29
Standby losses	W	52	54	56	63	63	72	69

Water

Water	Units	S3-40	S3-60	S3-70	S3-80	S3-100	S3-120	S3-150
Water content	litres	3	4	4.5	7.5	7.5	9.5	11
System design flow rate @ 25°C ΔT rise	l/s	0.38	0.52	0.67	0.76	0.95	1.14	1.38
Water side pressure loss @ 25°C ΔT rise	mbar	223	305	306	203	287	335	441
System design flow rate @ 20°C ΔT rise	l/s	0.48	0.72	0.84	0.96	1.19	1.43	1.79
Water side pressure loss @ 20°C ΔT rise	mbar	459	470	520	318	449	515	701
System design flow rate @ 11°C ΔT rise	l/s	0.87	1.19	1.52	1.73	2.17	2.6	3.14
Water side pressure loss @ 11°C ΔT rise	mbar	1539	1560	1890	1043	1457	1648	2278
Minimum water pressure	barg	1	1	1	1	1	1	1
Maximum water pressure	barg	4	4	4	6	6	6	6
Maximum flow temperature setting	°C	85	85	85	85	85	85	85

Gas

Gas	Units	S3-40	S3-60	S3-70	S3-80	S3-100	S3-120	S3-150
Gas flow rate, NG (G20) - maximum	m³/hr	4.2	5.8	7.4	8.5	10.2	12.7	15.3
Maximum gas inlet pressure, Nat Gas	mbar	25	25	25	25	25	25	25
Nominal gas inlet pressure, Nat Gas	mbar	20	20	20	20	20	20	20
Minimum gas inlet pressure, Nat Gas	mbar	17	17	17	17	17	17	17
Gas flow rate, LPG (G31) - maximum	m3/hr	1.6	2.3	2.9	3.3	3.9	4.9	N/A
Nominal gas inlet pressure, LPG	mbar	37	37	37	37	37	37	N/A

Flue
Flue
Units
S3-40
S3-60
S3-70
S3-80
S3-100
S3-120
S3-150
Maximum flue gas temperature @ 80/60°C Nat Gas
°C
79
75.5
74.5
66.5
72.5
73.5
73
Dry NOx emission (0% excess oxygen, mg/kWh dry air free)
mg/kWh
36
39
39
39
39
39
39

Flue	Units	S3-40	S3-60	S3-70	S3-80	S3-100	S3-120	S3-150
Maximum flue gas temperature @ 80/60°C Nat Gas	°C	79	75.5	74.5	66.5	72.5	73.5	73
Dry NOx emission (0% excess oxygen, mg/kWh dry air free)	mg/kWh	36	39	39	39	39	39	39

Electrics

Electrics	Units	S3-40	S3-60	S3-70	S3-80	S3-100	S3-120	S3-150
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
Power consumption - maximum boiler modulation	W	67	107	121	94	143	233	260
Approx shipping weight	kg	45	51	55	77	77	81	100
Noise emission @1m: @maximum modulation	dB (A)	50	59	60.2	67.7	64.7	64.9	59.2