Nesta

High Efficiency Condensing Boilers

Nesta

High Efficiency Condensing Boilers

A wide range of high output floor standing condensing boilers, sized from 120 to 250 kW. Suitable for medium or large residential and commercial installations. Perfect for new build projects or renovations that require a high and dependable heat output. Our stainless steel heat exchanger ensures high efficiency and reliability, with a compact size and small footprint.

NOx class:

108 %

Thermal efficiency up to:

10:1

Modulation ratio up to:

PERFORMANCE

heat input (net) G20	kW	11,2 - 115,5
heat input (net) G31	kW	28,9 - 115,5
heat output at 80/60°C G20	kW	10,8 - 112,8
heat output at 80/60°C G31	kW	27,9 - 112,8
heat output at 50/30°C G20	kW	12 - 124
heat output at 50/30°C G31	kW	30,5 - 122

EFFICIENCY

heating efficiency 80/60°C	%	96,5 - 97,8
heating efficiency 50/30°C	%	107,4 - 107,5
useful efficiency at 30% (return 30°C)	%	108,7
seasonal efficiency	%	93

GENERAL

water content	l	51
gas categories		I2H, I2E, I2E(S), I2E(R), I2ELL, I2HS, I2N, I2EK, I3P, II2E3P, II2E(S)3P, II2E(R)3P, II2EK3P, II2H3P, II2L3P, II2E+3P, IIEsi3P, II2Er3P
gas types		G20 - G25 - G25.1 - G25.3 - G31
chimney type(s)		B23 - B23P - C43 - C53 - C63 - C83
CO emission	mg/kWh	64,5
gas flow rate (G20)	m3/h	1,1 - 10,7
gas flow rate (G31)	m3/h	1,2 - 4,5
NOx class		6

DIMENSIONS

boiler width (A)	mm	648
boiler height (B)	mm	1524
boiler depth (C)	mm	631
empty weight	kg	185

CONNECTIONS

air inlet	mm	125
gas connection	in	3/4
water outlet	in	2
water inlet	in	2
chimney connection	mm	130
condensate drain	mm	25

Certificates (1)

Nesta 120-250 - DoC

pdf

Current technical manuals (2)

Nesta 120-250	pdf
Webserver	pdf

BIM (2)

Nesta 120-160-200-250	zip
Nesta 120-160-200-250 – Chaudière au sol	zip

Sales Brochures (1)

Nesta (EN)

pdf

Design

At the core of all NESTA boilers is our stainless steel Fire Tube heat exchanger. The use of high-grade stainless steel alloys ensures product durability, reliability, and higher resistance to corrosion and oxidation.

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Our unique Fire Tube design of Nesta heat exchangers is a market proven technology, manufactured and distributed worldwide for many years.
Our commitment to improvement and advancement in design has produced one of the most efficient boilers in its class.

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Fire Tube heat exchanger

One of the major advantages of Nesta Fire Tube heat exchanger is the self-cleaning feature. The unique design and orientation of the heat exchanger allows the condensate to run down the inside of the heat exchanger tubes and cleans any possible traces of combustion residue. This function allows the boiler to maintain maximum efficiency throughout the lifespan, leading to reduced running costs and maintenance for the end user.

Key Features & Benefits

Stainless steel heat exchanger
Self-cleaning flue ways
Internal circuit piping in welded stainless steel
Low pressure drop
Compact dimensions
Reduced maintenance
Can be installed in cascade up to 6 boilers
Low NOx

Evolved ECU flexibility

Intuitive for both the user and the engineer, complete with weather compensation functionality. The integrated AIC Electronic Control Unit (ECU) can manage up to 3 direct or mixed circuits and one circuit for DHW production via an external storage cylinder with anti-legionella function when installed with additional control accessories. It can also manage up to 6 boilers in cascade and has connectivity for regulation and remote control.

Internal control unit

The internal control unit of the Nesta boilers allows for management of cascades up to 6 boilers in a series of direct and mixed circuits and additional DHW circuit, with boiler management and alarm. The Nesta is also equipped for remote management via ethernet network or GSM router.

Ease of installation and maintenance

The Nesta boiler has a small footprint - only 0.5 m2, which promotes easy installation in plantrooms where space is at a premium. All models in the Nesta range are sized to allow easy passage through a 70 cm wide doorway, ensuring easy maneuverability without disruption to the building. Thanks to the boiler geometry, the self-cleaning flue ways of the Fire Tube exchanger simplifies routine maintenance operations and related costs, offering maximum efficiency over the entire life span the boiler.