Each model in the new Herald range features a 316L stainless steel heat exchanger that greatly improves resistance to corrosion and is supported by a 10-year warranty. They also offer very low NOx emissions of 39mg/kWh and are capable of working at high operating pressures of up 11bar making them particularly suitable for high rise buildings. They also deliver temperatures up to 88degC and at Delta T of 30degC.
Herald floor standing boilers are particularly compact; at 394mm wide they are narrow enough to fit through a standard doorway, and the largest model, at 228kW output, has a footprint under 0.5m2. At a maximum height of 1080mm they can cope with most headroom restrictions and can fit into the tightest of plant rooms.
Multiple flue options are available including horizontal or vertical concentric balanced flue, and traditional conventional flue where runs of up to 60m are achievable. The flue outlet connection is at the rear of the boiler, which makes Herald a great option for replacing traditional atmospheric boilers.
Herald Boilers meet the European Energy Related Products (ErP) Directive, which came into force last year and encourages replacement of traditional boilers with high efficiency, condensing technology. All models comply and details of the ErP seasonal space heating efficiency can be found on the company website. Two of the Herald models, HCB46CE and HCB61CE, are within the scope of the Energy label requirement and both are classified as ‘A’ label.
Herald boilers employ pre-mix burners with 5:1 turndown to closely match demand patterns and enhance operating efficiencies even under part-load conditions. Multiple installations offer further operational benefits as the integral controls include a cascade system. A 2-boiler installation for example, provides a combined turndown of 10:1; up to 8 boilers can be operated in ‘cascade’ providing up to 1.8Mw heat output.
A further feature of the cascade system is that should the lead’ boiler fail for any reason; the controls will automatically adjust the output of the other boilers in the cascade, designating another as ‘lead’ so there is no interruption to the heating provision.
With NOx emissions of only 39mg/kWh, Herald boilers qualify for the maximum three BREEAM points and tight management of each boiler’s operating pattern ensures an extended lifetime operation and reduced wear and tear.
The integral controls can negate the requirement for a BMS (although connection to a BMS is available). The controls also provide pump modulation in line with operating conditions and weather compensation control along with a temperature controlled ‘pasteurisation’ process to prevent build-up of legionella bacteria. This built-in control provision can considerably reduce installation cost and time even when the system is required to manage a number of separate heating zones.
Additionally, Lochinvar plans to further enhance the Herald range within the next few months by introducing its ‘App-based smart’ control option, which will allow the boilers to be controlled and monitored via a mobile devices.