Incorporating “fire tube” heat exchanger Nesta Plus range expanded to 1260kW capacity

The AIC Nesta range of floor-standing, highefficiency condensing boilers from C&F Quadrant is suitable for either medium or large residential and commercial installations. They are perfect for both retrofit or new-build projects, and are available in a choice of options from 120kW right up to 1260kW.

In fact, AIC just recently expanded the Nesta Plus range with the addition of new floor-standing condensing boiler models that come in outputs of 350kW, 1080kW and 1260kW. They are particularly suitable for commercial and industrial installations requiring greater thermal output.

The standard electronic controller on the Nesta Plus is designed for the management of up to six boilers in cascade. This also controls the boiler management functions and alarms, in addition to a multicircuit installation, when utilising additional accessories.

lt is also possible to manage the boiler, cascade and the entire system via the ethernet network or GSM router (with WEB Server Module).

The high water content (up to 600 litres) helps promote operational stability and a high efficiency of yield (108%). The small footprint and compact dimensions means they can be installed in areas where space is at a premium.

Nesta features and 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 six boilers;

• Low NOx levels;

• Lifting points for transportation and positioning.

The Nesta Plus high-output, singlepass condensing boilers have an impressive 7:1 modulation range that provides high seasonal returns and significant savings on gas consumption. Linear modulation addresses the needs of higher output plantrooms and allows the boiler to consistently achieve maximum efficiency, limiting boiler cycling as much as possible. This technology is effective in both new-build and retrofit heating systems. The Nesta Plus controller enables remote boiler management by web server connectivity. One of the primary benefits of this advanced integrated control system is the optimalisation of periodic servicing using self-diagnostics to assist the engineer prior to attending site.

At the core of all Nesta boilers is AIC’s stainless steel “Fire Tube” heat exchanger technology. The use of high-grade stainless steel alloys ensures product durability, reliability and higher resistance to corrosion and oxidation.

The completely immersed flue gas tubes of the “Fire Tube” exchanger, with their high heat transfer coefficient between water and smoke, ensure an optimal counter-current exchange over the entire length of the exchanger. This allows AIC condensing boilers to reach very high efficiency, without the risk of oxidation. Another advantage is the selfcleaning 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 its lifespan, leading to reduced running costs and maintenance for the end-user.