Design, Specification & MCS Registration


One Planets consultants offer our customers and installers insurance backed system designs including heat loss calculations, heat emitter sizing, under floor heating which comply with current regulations.

We will ensure through accurate design that the efficiencies of the system will deliver the required amount of heat and hot water required for each home to be at the comfort level desired for every client.

For example, before considering a ground source heat pump, it is important to explore ways of minimising space heating and hot water demand by incorporating energy efficiency measures. (For possible measures see ‘Domestic energy efficiency primer’ (GPG171/CE101)).

The most important first step in the design of a GSHP installation is the accurate calculation of the building’s heat loss, its related energy consumption profile and the domestic hot water requirements.

This will allow accurate sizing of the heat pump system, which is particularly important because the capital cost of a GSHP system is generally higher than for conventional systems, and economies of scale are more limited. Oversizing will significantly increase the installed cost for little operational saving, and will mean that the period of operation under part load is increased. Frequent cycling reduces equipment life and operating efficiency. If the system is undersized, design conditions may not be met and the use of top-up heating, usually direct acting electric heating, will reduce the overall system efficiency. It is for these reasons that system design should only be done by a qualified heat pump designer.

MCS Registration and the Renewable Heat Incentive (RHI)

Every customer customers will need the following documentation to be eligible for the RHI. The more information you can give them upfront, the smoother the application process will be.

  • An MCS certificate (within 10 working days of the commissioning date)
  • An MCS compliance certificate (and where the MCS installation number is on it)
  • An EPC that is less than 24 months’ old
  • An itemised invoice showing parts and labour
  • The completed Installer Metering Questions document for heat pumps (only if the heating system need to be metered). There’s also an Alternative Metering Arrangements document for biomass or for heat pumps, if required.
  • Advice on the heating system’s maintenance, servicing and efficient use. This is because your customer must keep the heating system in good working order throughout their seven years on the scheme. You should also explain what actions might invalidate the warranty
  • Advice on how to use and read meters (if they need them).
  • Calculations and performance predictions for the system installed.

Complete and full applications will help to quickly qualify (where applicable) for the government incentives.


Earn money when you install heat pumps

The government has introduced grants to incentivise the adoption of ground source heating in the UK.