With energy efficiency high on the agenda for facilities managers of commercial premiises, it’s crucial that heating systems are not only cost effective, but deliver maximum carbon savings too. Replacing an old, inefficient boiler may seem an easy fix, but Steven Evans, national sales manager at Potterton Commercial, explains why boiler cascades should also be considered

th energy efficiency high on the agenda for facilitie cruci Replaci g an old, rs o co that heati g systems are not only cost effective, but deliverm xim rcial p at Potterton Commercial explainsw y boi er cascades shoul also be consi ered that ensure the boilers operate at

maximum efficiency, respond rapidly to changes in usage patterns and exten d the operating life and reliability of the equipment.


Cascade systems comprisemultiple linked boilers, which can respondmore efficiently to changing heat loads and offermore flexibility tomatch the exact heat requirements of a building. Individual boilermodulation ensures flexibility by enabling each boiler to adjust its

operating capacity in line with demand. For example, the Potterton Sirius Tw o wall-hung condensing boiler has a modulation ratio of 9:1, and for every additional boiler added to the system the modulation range improves by a multiple of nine. With three linked boilers, a modulation range of 27:1 can be achieved, delivering efficiencies plus low

flue gas emissions. impressive

Cascade systems also offer a high

ccording to the Carbon Trust, heating and hot water can account for asmuch as 60 per cent of total energy use in a commercial building1

A . It’s not unsurprising

then that energy saving has become a key driver formany facilitiesmanagers. What’s more, from 2018 all rented commercial premises will need to meet new minimum Energy Performance Criteria (Epc) and)and it will be unlawful property that

is classed as below an E rat for a landlord to rent out a

One way building owners

can boos t ing.

their rating and safeguard those all- important energy and cost savings, is to install a newer, more efficient boiler. In some situations, the need to replace will be self-evident - for example, where outdated, inefficient systems lead to high maintenance costs. Even systems that appear to be performing adequately may have a high-energy cost so it is always worth reviewing boiler perf Any heating system must

be accurately ormance.

sized to the predicted demand of th e building to ensure efficiency operation. It has long been recognised that there has been a tendency to oversize boilers. Often this has come about through a natural desire to err on the side of

caution to avoid complaints from users of under-performing systems.


It should never be assumed that like- for-like replacement in terms of boiler capacity offers the best solution. Boilers have often been specified without considering the building’s heat gains from people, lighting and equipment. Even if such heat gains were taken into account when the original system was sized, changes in use, occupancy, and amount and type of heat-emitting

equipment may have occurred over time. Therefore, it is important to size a replacement installation based on the requirements, rather

needs to be flexi originally specifi than rely on the current building

ble enough to respond ed. The system also size of the boiler

swiftly, accurately and efficiently to changes in heating and hot water demand, and therefore needs to be intuitive enough The energy eff

Figure 1: Figure 1: The Potterton Sirius Two Tw atio of 9:1, and for

every additional boiler added to the system the modulatmodulation rangeion range

he Potterton Sirius Two wallwall-hung condensing-hung condensing boiler has a modulatboiler has a modulationion rratio of 9:1, and for every additional boiler added to the system the

improves by a multiple of nine

improves by a multiple of nine

turndown capability when only one boiler is needed. The flexibility of this approach also means that the system will still wor k if one boiler in the cascade needs to be serviced or repaired.

Boiler cascades come in one package from a single manufacturer with

components designed to work seamlessly together as a single systems that ensure

optimum demand- product and control

matched performance. The compact, modular framework offering logistical ease in restricted space, whilst saving installation time an d costs. Furthermore , when it comes to se maintenance, a casc

ade system allows rvice and

iciency of a building can to achieve this.

obviously have a direct impact on overhead costs, so there are goo d arguments for considering alternative approaches to boiler system design. Boiler cascades are rapidly emerging as a perfect solution for commercial heating systems, delivering significant cost and energy savings. They marry the best in modern heating technology with controls

Reference 1.


Reference 1.

https://www.carbontrust .com/resources/guides/e nergy-

https://www.carbontrust .com/resources/guides/e nergy-

efficiency/heating- ventilation-and-air-condit ioning-hvac/


engineers to work on each individual boiler, whilst the remaining boilers on the cascade stay switched on - reducing disruption to building occupants. With a cascade system, the issue of boiler oversizing, which adds to capital cost and reduces seasonal efficiency, can be eliminated, and a more flexible, responsive system can be achieved that delivers both optimum performance an d energy savings. A so words, that ticks all

while delivering increased user benefits. Potterton Commercial

ventilation-and-air-condit ioning-hvac/ T: 0345 070 1055

/ ENERGYMANAGEMENT ENERGYMANAGEMENT se , it’s carbon savin s too. efficient boi ermay seeman easy fix, but Steven Evans, nat onal salesmanager CUT COSTS WITH BOIL ER CASC ADE S

the regulatory boxes lution, in other

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