Project Summary

  • A heat loss of 8 kW at a design outdoor temperature of -2°C.
  • A maximum flow temperature at 55°C to meet RHI eligibility criteria corresponding to a Seasonal Performance Factor of 3.1
  • Ground Source Heat Pump: NIBE F1145 12kW with an output of 11kW at design temperature
  • A 200 litre buffer tank
  • A 215 litre hot water cylinder
  • 7 year parts and labour warranty on NIBE equipment
  • Hot water cylinder covered with a 25 year warranty

Services provided by Better Planet

  • A room by room heat loss calculation as required by MCS.
  • A review of the heating distribution system – a combination of radiators and under floor heating. This review resulted in a recommendation to upgrade radiators in some of the rooms to make it possible to operate the heat pump at a low flow temperature and maximum efficiency.
  • A draft EPC prior to the installation including an estimate of the kWh’s required for space heating and hot water. This information made it possible to forecast the tariff payments expected from the RHI scheme.
  • Geological survey for boreholes
  • Design documented in a Project Planning Pack including;
  • Mechanical schematics
  • Wiring Diagrams
  • Location of main components
  • Supply and installation of the heat pump, control unit, buffer tank, hot water cylinder and required plumbing items.
  • Supply and installation of the additional radiators for some of the rooms.
  • Adjustment of the existing under floor installation.
  • A Green Deal Assessment including an EPC, post installation, to demonstrate RHI eligibility.
  • MCS certificate.


Mr Bowell based in Hertfordshire lives in a detached 5-bedroom bungalow, he wished to replace is ageing oil fired boiler to a more economical heating system.

Mr Bowell contacted Better Planet for a free site visit where we explained the importance of sizing a heat pump correctly and analysing the exiting heating system to ensure the ground source heat pump would work correctly and efficiently. This analysis was carried out at Mr Bowell’s property and gave Better Planet the correct information to advise him on the system and any upgrades that were required. We also ensured a geological survey was carried out for the area to enable us to calculate how much energy could be abstracted from the ground.


The new system is made up of a NIBE F1145 12kW ground source heat pump, 215ltr Advance Appliances hot water cylinder, 200ltr NIBE UKV buffer tank and a two 95m bore holes. Mr Bowell had already gone to some lengths to lower his energy bills by installing solid wall insulation but to qualify for the Renewable Heat Incentive (RHI) he had to increase his loft insulation to 250mm which helped keep his heat losses to a minimum.  Since the heat pump works to a lower flow temperature than the previous system, Better Planet recommended re-sizing some radiators to allow the rooms to achieve the correct room temperatures.


Currently drilling works are complete and Better Planet are finalising the installation internally.