PHAM NEWS | NOVEMBER 2026 HeatPumps 27


Calculate the cost of running a heat pump


Renewable heating specialist Dwellow has launched an interactive heat pump running cost calculator designed to address a common question for installers and consumers: how much will a heat pump cost to run? Unlike calculators that produce


estimated savings based on fi xed assumptions, the tool allows users to change the variables behind the calculation and see the eff ect on predicted running costs. Users can also adjust annual heating


demand, heat pump effi ciency, electricity tariff , existing heating system and energy prices, as well as modelling the potential impact of solar PV and battery storage. The tool then recalculates the fi gures


in real time, allowing diff erent scenarios to be compared rather than presenting a single estimate. Estimates of heat pump running costs can vary signifi cantly depending on the assumptions used. A change in seasonal coeffi cient of


performance (SCOP), for example, can alter projected electricity consumption. Similarly, a diff erent electricity tariff can change the running costs without any change to the heat pump itself. The Dwellow calculator allows these assumptions to be adjusted individually,


Expanded range opens up the options


The Aquarea air-to-water heat pump range manufactured by Panasonic Heating & Cooling now includes two residential series designed to give installers greater fl exibility when working in both new-build and retrofi t properties. The High-Performance M Series uses


R290 refrigerant, while the N Series is a refrigerant split system using R454C, which has a global warming potential (GWP) below 150. Both ranges are available in 3, 5, 7 and 9kW capacities, with compact indoor units designed to fi t properties where installation space is restricted. The M Series can deliver


enabling users to explore how diff erent system designs and energy prices could aff ect running costs. The calculator can also be used by


installers when discussing running costs with prospective customers. Rather than relying on generic comparisons between boilers and heat pumps, installers can use diff erent inputs to demonstrate how system effi ciency, heat loss and tariff choice aff ect running costs. It can also illustrate why predictions


made before installation should not be treated as guarantees of future energy bills. ◼ phamnews.co.uk/1126/37


Clever way to add AC to a system


when added to an existing Cosy heat pump installation. Octopus estimates that conventional air-conditioning systems can cost between £2,000 and £6,000 to install. The device is designed to connect to existing pipework, with installation expected to take around three hours. About the size of a tall kitchen bin, the


Octopus Energy is developing a cooling unit that will allow its Cosy heat pump systems to provide chilled air during hot weather, without the need to install a separate air-conditioning system. The Cosy Cooler, set to be launched next year, is expected to cost £500-600


Optimised for time-of-use and solar input


Smart controls from Passiv UK can now be used with Navien’s PEM750 air source heat pump, following a partnership between the two companies. The Passiv Smart Thermostat adjusts


fl ow temperatures and responds to time-of-use electricity tariff s and surplus solar generation to help reduce heating costs. Its ecoHeat feature has been independently verifi ed by the Energy Saving Trust as improving heat pump effi ciency by 17%, with potential heating bill savings of up to 30%. The thermostat works with Navien


heat pumps without additional hardware, simplifying installation by removing


the need to confi gure static weather compensation curves manually. Installers also receive free access to


the Passiv Portal for remote monitoring and diagnostics. Customers can join Passiv’s Greener Grid Payment scheme, which rewards households for allowing heat pump operation to adjust during periods of grid constraint, without compromising home comfort. ◼ phamnews.co.uk/1126/40


portable unit draws in warm indoor air and passes it across a heat exchanger to cool it before circulating it back into the room. The outdoor heat pump chills the water that fl ows through the central heating pipes. Depending on the heat pump model, the


system can serve a single room or support two to three cooling units operating in diff erent rooms. ◼ phamnews.co.uk/1126/39


Up to


EPC A on New Build Properties


water temperatures of up to 75°C at an outdoor temperature of -10°C, making it suitable for some boiler replacement projects involving high- temperature radiators. It can operate at outdoor temperatures down to -28°C and achieves energy ratings of up to A+++ at a 35°C fl ow temperature. The N Series off ers seasonal effi ciency


ratings of up to A+++ at 35°C and A++ at 55°C. Its split confi guration allows refrigerant pipe runs of up to 50m, with a maximum height diff erence of 30m between indoor and outdoor units, providing fl exibility across diff erent building layouts.


Both ranges feature redesigned all-in-one


indoor units with front height adjusters and rear castors to aid positioning. Top- access wiring and magnetic access panels are intended to simplify installation and servicing. Cloud Adaptor connectivity comes as standard with both ranges. Homeowners


can use Panasonic’s Comfort Cloud app to control heating and hot water remotely and monitor energy consumption, while installers can access Aquarea Service Cloud for remote system monitoring and maintenance. The M Series compact all-in-one unit


stands 1,427mm high, while the redesigned N Series equivalent measures 1,575mm high and has a footprint of 599 x 602mm. ◼ phamnews.co.uk/1126/38


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