Recently, Neil Schofield, head of government affairs at Worcester Bosch, described his views on what he sees as ‘flawed approach’ in the Committee for Climate Change’s (CCC) ambition to use heat pumps to lower emissions in homes off mains gas. Guy Ransom, pictured, commercial director of Finn Geotherm, one of the UK’s leading heat pump companies and winner of NACRHP Awards in 2018 and 2017, explains why he believes heat pumps are a viable option.
Despite this significant passage of time, we continue to question the viability of a technology which is able to generate 4kW of heat for every 1kW of electricity used, has no emissions other than those associated with the ever-cleaner electricity it uses and which, when correctly designed and installed, can deliver heat to virtually any building in the UK. Heat pump technology is tried and tested – and available now.
It is an obvious fact that any building can be heated by matching the energy loss at a given target temperature with energy input. A heat pump is simply an efficient means of supplying a given amount of energy. As such, the system can be scaled to meet the needs of a one-bedroom bungalow, perhaps 5kW, or a 27-bedroom stately home, perhaps 120kW. The key then is not the source of the heat, but the appropriate means of distributing it.
A well designed heat pump system can ably heat properties of all ages and sizes. Low EPC ratings and levels of insulation are not a barrier to a heat pump installation. Finn Geotherm has been installing heat pump systems since 2006 and includes several large, listed stately homes within its project portfolio. It is a fact that, despite the age, low EPC rating and lack of insulation of these large country houses, the occupants have been more inclined to complain of being too warm following their heat pump installation than too cold.
Heat pumps work most effectively at a lower operating temperature than combustion boilers – typically 50°C versus 80°C flow. They are also however designed to work with longer duty cycles so, rather than providing a rapid inrush of heat, energy is delivered steadily over a longer period than traditional boilers. We are very familiar with this principle in underfloor heating. Correctly sized radiators are also totally effective in working with heat pumps to maintain desired room temperatures, even in the draughtiest of buildings.
It is true that the installation of a ground source heat pump system will be considerably more expensive than installing a traditional oil boiler, perhaps three times as much. Given the fact that a heat pump will last typically three times as long as a condensing boiler and that, during every year of its life, it will generate significant savings on heating, this additional upfront cost is more than paid for during the system’s lifetime. Coupled with the additional benefit of the RHI which is currently available, heat pumps have a relatively short payback period.
Heat pumps do not use any kind of combustion-based fuel and we are not waiting for new fuels to be developed in order to start heat pump installations. We can install clean, green heat pumps now – so why, as a nation, aren’t we doing more of this? The CCC estimates we will need to install over two million more heat pumps by 2030 – accounting for 345tWh – if we are to stand any chance of meeting the required carbon reduction targets. This will require a dramatic change from the current position where heat pumps account for less than one percent of annual heating installations.
We have to break our love affair with high temperature heating. Specifiers and architects need to incorporate these systems into both public and private building projects alike. Housing associations must also embrace the technology and the idea of district heating schemes to reduce endemic problems of fuel poverty. Meanwhile, the CCC is correct in saying “climate change will not wait while we consider our options”.