PHAM NEWS | OCTOBER 2025 26 Gas & OilBoilers


Suited for homes with a hot water cylinder


The NCB500 system boiler has been designed by Navien to help homeowners benefi t from all the advantages of its NCB500 combi boilers, such as a 10-year warranty, stainless steel heat exchanger and cupboard-fi t dimensions. This system boiler is off ered as a cost-eff ective heating solution, particularly for properties that already have a hot water cylinder. The new model features a


stainless steel heat exchanger, which contributes to its durability and lifespan. It operates with a fully modulating feature that allows it to adjust outputs between 15 and 30kW, accommodating various household sizes and installation needs. This fl exibility is further enhanced by its lightweight design, making it suitable for installation in kitchen cupboards or utility areas. The boiler also includes an NG


and LPG conversion kit, facilitating installation in homes without


Off set fl ue adapter simplifi es and speeds up replacements


To make boiler replacement work more straightforward, Baxi has introduced an off set fl ue adapter that allows installers to connect new boilers to existing fl ue hole positions. This reduces the likelihood of extra drilling or repositioning when alignment varies between older and newer units, which is particularly helpful when replacing standardsize boilers with more compact models where fl ue positions may not align. The adapter is compatible with


mains gas access. The text-driven display seamlessly integrates with Navien’s Smart Plus controls, allowing homeowners to monitor their energy usage and achieve optimal performance with greater ease. This feature is benefi cial in areas with fl uctuating water pressure, ensuring a reliable supply of hot water. Graham Parkes, commercial


director at Navien UK, says: “We’re delighted to be adding the NCB500 system boiler to our already impressive product lineup. This addition off ers installers an extended range of solutions to suit the needs of their customers.” ◼ phamnews.co.uk/1025/44


all Baxi compact combi and system boilers and can be used in situations where a right-hand off set fl ue was previously installed. According to Andy


Speake, product manager at Baxi, there could be as many as 1.5 million boilers currently in use that have an off set fl ue and will need replacing with a modern, central- fl ue boiler. “The new off set fl ue adapter


simplifi es the replacement of legacy Baxi and Potterton combi


and system boilers which had an off set fl ue position,” says Andy. ◼ phamnews.co.uk/1025/45


Modern solution for commercial projects


Designed for use in residential blocks, commercial premises, and industrial buildings, the TopGas Max from Hoval is a wall-mounted gas condensing boiler available in outputs from 50 to 150kW. Its compact size and modular construction are said to make transport and installation easier, especially in plant rooms with limited space. The TopGas Max off ers a modulation range of 20 to 100%, enabling the unit to adjust automatically to changing demand, with an effi ciency rating of up to 108.2% at part load. With noise levels recorded at 51-53 dB(A), it is suitable for installation closer to occupied areas. The boiler can operate as a single unit, in cascade or be


combined with heat pumps in hybrid systems. Integration and control are supported by Hoval’s TopTronic E platform. ◼ phamnews.co.uk/1025/46


Expand your business with OFTEC


OFTEC is well known for its commitment to liquid fuel heating training and registration, but did you know that we offer a range of other options for anyone working in today’s heating industry?


Competent person scheme registration: • Liquid fuel • Solar heating • Biomass • Unvented hot water systems


• Solid fuel • Heat pumps • Electrical (Part P)


Extensions of registration: • MCS


• Trustmark • PAS2030


OFTEC registration enables you to self-certify work* and your installations are covered by our free workmanship warranty. You’ll also be listed on our ‘find a technician’ web search, have access to our technical support, and get all the latest industry news, together with a range of other valuable benefits.


*In England, Wales, the Channel Isles and Isle of Man.


www.oftec.org PHAM-OFTEC-OCT.indd 1 30/09/2025 14:50:18 Best Buy endorsement – again!


Worcester Bosch has been named the Which? Recommended Brand accolade for its gas boilers - making it the fi rst gas boiler brand to be endorsed by Which? 16 times. The boilers were rated fi ve out of


fi ve stars for reliability and ease of sourcing spare parts, as well as four stars for ease of servicing, support for installers and build quality. Overall, for customer and heating engineer scores the company’s boilers received fi ve and four stars respectively. Jo Shepherd, sales and marketing


director at Worcester Bosch, says: “The Which? Recommended Brand endorsement is a great recognition for us as a company, but also helps our installers. With the recognised seal of approval, they have additional leverage when speaking to their customers.” ◼ phamnews.co.uk/1025/47


Floorstanding has high outputs


Targeting commercial heating applications, the Varmax Mk2 from Hamworthy Heating is a fl oorstanding condensing boiler range available in six models, with outputs of up to 450kW from a single unit. The range can also be confi gured in cascades for larger installations. The Varmax Mk2 features


a stainless steel heat exchanger designed for long-term reliability and resistance to varying water conditions. Recent updates include a touchscreen interface for simplifi ed operation and an improved casing that allows easier


access to key components, aiming to reduce installation and maintenance time.


The boiler incorporates a built-in fl ue gas non-return valve, a simplifi ed fl ue system, and insulated construction to reduce standby losses. It does not require a dedicated primary circuit or minimum fl ow


sim re


rates, which can save time and costs during installation. The range is intended for use in buildings with high heating demand, including schools, offi ces, and healthcare


facilities. ◼ phamnews.co.uk/1025/48


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40