Viwa 50-65

Size
725 x 420 x 385 mm.

Heat Exchanger
Stainless Steel Heat Exchanger

Capacity
Efficient solutions for different needs with 50 and 65 kW capacity options.

Cascade Installation
Cascade Installation Feature for installations up to 390 kW with 6 x 65 kW capacity

Control Panel
Easy-to-Use LCD Display Control Panel

Sound Level
58-61 dB

Design
100% Domestic Design

Efficiency
High efficiency with a 1:8 modulation ratio.

Viwa 50-65, the 'Smart Gas Technology Boiler' in its segment, offers both savings and safety in a single device with a high modulation range.

Stainless Steel Heat Exchanger and Burner.
Master Control System on All Devices *
Stainless steel heat exchanger that minimizes the risk of clogging
Integrated with both hermetic and standard chimneys for easy use (compatible with Type B and C chimneys).
High Efficiency and Long-Lasting with Aging System
Ability to use in tall buildings (up to 6 bar)
Central heating system power up to 389 kW / 6 Cascade
2 Year Warranty
Optimized for minimum damage with built-in sediment trap
High level of insulation and low heat loss
Control via mobile phone with RecoWa Smart Room Thermostat Kit and RecoWa application * (single boiler)

Product Compare

Product Information Form

TECHNICAL DATA	UNIT	Viwa 50					Viwa 65
Gas Circuit
Gas type		G20	G25			G31	G20	G25			G31
Gas supply pressure	mbar	20		25	37		20		25	37
Gas Consumption at Maximum	m³/h	4.809	5.767			1.952	6.506	7,4			2,45
Gas Consumption at Minimum	m³/h	0,619		0,758	0,26		0,825		0,94	0,32
*(Natural Gas G20) Heat Load (Hu=10,56 kWh/m3)
Premix System		Gas Adaptive					Gas Adaptive
Modulation Range			1/8					1/8
Heat Exchanger Material		Stainless steel					Stainless steel
Efficiency		G20		G25	G31		G20		G25	G31
Seasonal Space Heating Energy Efficiency Class	%	A					A
Seasonal Space Heating Energy Efficiency (ŋs)	%	92	92			91	93	92			91
Useful efficiency at rated heat output and high temperature regime(2) (ŋ4)	%	88,07					87,8
Useful efficiency at 30% of rated heat output and low temperature regime(1) (ŋ1)	%		97,11					97,39
Radiator Circuit		G20		G25	G31		G20		G25	G31
Maximum heat input Qn	kW	50	50			50	65	65			65
Minimum heat input Qn	kW	6,5		6,5	6,5		8,0		8,0	8,0
Useful heat output at rated heat output and high temperature regime (2) (P4)	kW	45,73	48,7			48,7	57,78	63,2			63,2
Useful heat output at 30% of rated heat output and low temperature regime (1) (P1)	kW	8,12		8,9	8,7		11,54		11,5	11,2
Maximum Heat Output Pn (80/60 °C)	kW	48,70	48,70			48,70	63,2	63,2			63,2
Minimum Heat Output Pn (80/60 °C)	kW	6,20		6,20	6,30		7,8		7,7	7,7
Maximum Heat Output Pn (50/30 °C)	kW	52,60	52,60			51,40	68	68			66,5
Minimum Heat Output Pn (50/30 °C)	kW	6,80		6,80	6,70		8,5		8,4	8,2
Temperature selection range (min÷max) high temperature	°C	25÷80
Temperature selection range (min÷max) low temperature	°C	25÷47
Operating Pressure (Maximum)	bar	4
Operating Pressure (Minimum)	bar	0,5
Temperature adjustment range (DHW)	°C	35 - 60
Electricity Circuit
Electricity Supply	V AC–50 Hz	230 V + %10; - %15
Protection Index	IP	IPX5D
Electricity Consumption (Max./Min.)	Watt		172 / 92					231 / 100
Exhaust Gas Circuit		G20					G20
(80/60 °C) Exhaust gas temperature (Min. / Max.)	°C		55.7 / 62.1					61.4 / 72.0
(50/30 °C) Exhaust gas temperature (Min. / Max.)	°C	37.2 / 44.4					40.0 / 51.0
NOx	Class	6	6				6	6
Weighted value of NOx (GCV)	mg/kWh	40		52			40		48
Flue mass flow rate (60/80°C - Qn) Nominal/Minimum	g/s		22.25 / 2.83					28.50 / 3.50
Fan head loss	Pa	12 ÷ 170					12 ÷ 210
General
Dimensions (H x W X D)	mm	725 x 420 x 385
Sound Level	dB (A)		61					58
Net Weight	kg	40					46
Packed Device Weight	kg		42					48
Type		B23 , B23P , B33 , C13 , C33 , C43 , C53 , C63 , C83 , C93
Category		I2H, I2E, I2E+, I2E(s), I2L, I2ELL, I3P, II2H3P, II2L3P aII2E+3P (G20=20 mbar)
(1) Low temperature means for condensing boilers 30 °C, for low temperature boilers 37 °C and for other heaters 50 °C return temperature (at heater inlet). (2) High temperature regime means 60 °C return temperature at heater inlet and 80 °C feed temperature heater outlet.