Warmhaus Ewa Combi Boiler

Ewa Combi Boiler

Ewa Combi Boiler
Dimension Dimension
725 x 420 x 288
Capacity Capacity
20 kW and 24 kW
User Panel User Panel
Button-Control Panel
Sound Level Sound Level
52 dB
Savings Rate Savings Rate
High savings with 1:7 modulation
Efficiency Efficiency
Up to 97.5% high efficiency

Ewa, with a compact and aesthetic design, ensures efficiency, safety, and perfect combustion through the "Smart Gas" technology.

  • High efficiency with long-lasting stainless steel heat exchanger
  • Continuous on-demand hot water with pre-heat
  • Custom Design Metal Front Panel
  • Compliant with EU ErP Directive
  • Durable front surface with polymer glass finish
  • Hot water comfort with high flow rate
  • Lowest NOx Emissions in Exhaust Gas (Class 6)
  • High level of insulation and low heat loss
  • Compatible with both Natural Gas (NG) and Liquefied Petroleum Gas (LPG) without the need for part replacement for LPG.
  • ErP Compliant Frequency-Controlled Pump
TECHNICAL DATA UNIT Ewa 20 Ewa 24
Gas Circuit / Gas Type   NG / G20 NG / G25 LPG / G30 LPG / G31 NG / G20 NG / G20 LPG / G30 LPG / G31
Gas Supply Pressure   20 25 30 37 20 25 30 37
Gas Consumption at Minimum / Maximum m³/h 0.36 /2.12 0.42 / 2.58 0.13 / 0.71 0.81 / 0.14 0.37 / 2.38 0.43 / 2.85 0.11 / 0.73 0.11 / 0.92
Seasonal Space Heating Energy Efficiency Class   A A
Seasonal Space Heating Energy Efficiency (ŋs)  % 91.2 91.2 90.5 90.5 92 92 92 92
Useful efficiency at rated heat output and high temperature regime(2) (ŋ4) % 87.6 87.6 88.3 88.3 87.6 87.6 87.6 87.6
Useful efficiency at 30% of rated heat output and low temperature regime(1) (ŋ1) % 96.4 96.4 95.5 95.5 97.5 97.5 97.5 97.5
Radiator Circuit / Temperature Selection Range  High / Low  °C 25 - 80  /  25 - 47 25 - 80  /  25 - 47
Minimum / Maximum Heat Output Pn (50/30 °C) kW 3.7 / 20.6 3.6 / 21.1 3.5 / 20.4 3.6 / 20.6 3.6 / 25 3.6 / 25 3.6 / 24.7 2.9 / 25
Minimum / Maximum Heat Output (Pn) (80/60 °C) kW 3.4 / 19.4 3.3 / 19.6 3.4 / 19.5 3.4 / 19.5 3.0 / 23.7 3.0 / 23.7 3.2 / 23.6 2.5 / 23.7
Operating Pressure (Maximum/Minimum) bar 3 / 0,5 3 / 0,5
Expansion Tank Volume L 7
Maximum Pump Delivery Head (Q = 0 m3/h)(at constant flow rate) mH2O 6,2 (700 l/h) 6,2 (700 l/h)
Max. Pump Flow Rate m³/h 2,3 2,3
Domestic Hot Water Circuit / Temperature Adjustment Range °C 35 - 60 35 - 60
Water Heating Energy Efficiency Class / Declared Load Profile   A / XL A / L A / XL
Water Heating Energy Efficiency % 85 81 84
Gas Consumption at Maximum m³/h 2,47 2,83 0,73 0,94 2,55 3,051 0,78 0,98
Modulation Rate    15/100  15/100  15/100  15/100  14/100  14/100  14/100  14/100
Maximum / Minimum DHW Heat Input kW 23.7 / 3.5 23.7 / 3.5 23.7 / 3.5 23.2 / 3.5 25.8 / 3.5
Max. Domestic Hot Water flow rate Minimum / Maksimum (Δt: 30 °C) L/min 1,5 / 11  1,5 / 12 
DHW Pressure (Minimum / Maksimum) bar 0,5 / 10 0,5 / 10
Electricity Circuit / Electricity Supply / Protection Index IP [230 V +%10; -%15]   /   IP X 5D [230 V +%10; -%15]   /   IP X 5D
Electricity Consumption  (Min./Max.)  Watt  57 / 86 55 / 95
Exhaust Gas Circuit G20 G25 G30 G31 G20 G25 G30 G31
Maximum Flue Lenght (Ø60/100 mm) [Horizontal* / (Vertical*]  10 / 11 10 / 11
(80/60 °C) Exhaust gas temperature (Min. / Max.) ºC 55 / 78 55 / 78 54 / 78 54 / 78 69 / 71 65 / 70 57 / 70 60 / 70
(50/30 °C) Exhaust gas temperature (Min. / Max.) ºC 37 / 57 37 / 57 41 / 55 41 / 55 49 / 51 48 / 49 43 / 57 47 / 51
Weighted Value of NOx (GCV) (NOx Class: 6) mg/kWh 33 33 38 38 20 19 42 31
General / Dimensions (H x W X D) mm 725 x 420 x 288 725 x 420 x 288
Sound Level dB (A ) 52 52
Net Weight / Packed Device Weight kg 30 / 31,8 32,6 / 33,8
Type   B23, B23P, B33, B33P, B53, B53P, C13, C33, C43, C53, C63, C83, C93, C(10)3 
(1) Low temperature means for condensing boilers 30 ºC, 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 at heater outlet.
* At the maximum flue distance, the flue length should be reduced by 1 meter for every 90° bend and 0.5 meter for every 45° bend.

Superior Features of Warmhaus

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High Safety with Gas Adaptive Technology

The Gas Adaptive Technology automatically detects gas quality and prevents improper combustion, ensuring safety. Proper combustion maximizes energy efficiency, utilizing the full potential of the gas.

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Long-Lasting Use with Stainless Steel Heat Exchanger

The use of wide-channel, seamless, single-coil stainless steel domestic hot water heat exchangers ensures a long lifespan.

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High Savings with 1:7 Modulation

With a wide modulation range of 1:7, it can reduce its power, allowing you to adjust its capacity according to your needs and save both gas and electricity.

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Continuous On-Demand Hot Water with Pre-Heat

By selecting the pre-heating parameter in your combi, the waiting time for hot water usage is minimized.

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Hot Water Comfort with Dual Taps

With a hot water capacity of up to 14.4 liters per minute, it allows you to simultaneously use hot water from two taps.

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Corrosion-Resistant Brass Hydroblock

Featuring brass and composite components that are resistant to thermal stresses and corrosion, ensuring a long lifespan and years of trouble-free use.

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Compact Size

The Ewa series boilers can be easily installed in limited spaces and can be comfortably used in all living areas.

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Smart Digital Display

An illuminated, wide information screen that allows you to access information about heating, hot water, pressure, and adjustments.

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Quiet Operation

Operates very quietly thanks to high level of insulation.

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Compliance with ErP Directive for Lowest NOx Emissions in Exhaust Gas

Achieving the best class level, which is level 6, for NOx as stipulated by the ErP Directive, helps reduce air pollution by lowering harmful NOx emissions.

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High Protection System

High Protection System/bypass circuit and prevents the pump from overworking

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