“The only real alternative for this property would have been oil which would have incurred significant installation and running cost. The cascade system therefore proceed to be ideal as it offers a cost effective solution.”

Chris Whiteford
Mitsubishi Electric

2x14kW Ecodan Air Source Heat Pump

300L Cylinder

20W Heat Demand

The Challenge

Off-Gas Location

The original farmhouse was in an off-gas area and as is typical of this type of property, has no heating system apart from open fires. The only real alternative would have been oil which would have meant significant install and running costs.


Specification of the homeowner was for underfloor heating throughout the property which incorporated a number of different floors and levels with the remaining rooms wanting antique radiators.

House v4

The Requirements

Limited space

With the limited space surrounding the property, a bespoke solution was called for which would meet the requirements of the homeowner while also proving cost effective to run.

Single phase electric supply

A further complication came from the single phase electricity supply and extensive costs which would need to be met by the homeowner if a 3-phase power supply had to be installed to the property.

Cylinder v2

The Solution

Cascade System

To resolve these issues, the installer, Source energy, specified an Ecodan air source heat pump cascade system, which rotates the workload between the individual heat pump to maximise efficiency. Two 14kW Ecodan air source heat pumps were installed to linked to a 300 litre Kingspan stainless steel hot water tank to meet the 20W heat demand and supply a sufficient volume of hot water to meet the needs of the occupants.

Reducing carbon footprint and annual running costs

Going forward the homeowner can enjoy a sustainable, eco friendly heat system which is efficient to run and provides copious amounts of hot water. More importantly, they are taking advantage of a system which uses renewable energy resulting is significantly reducing their carbon footprint and annual running costs.

Heat pump v3

Products Used

Ecodan R32 Zubadan PUZ Monobloc: Utilises advance technologies and R32 refrigerant to deliver improved efficiencies. Designed to satisfy larger domestic premises, the patented Zubadan technology is able to maintain a stable heat output at very low temperatures.

  • Self-contained unit, only requiring water and electric connections
  • No need for gas supply, flues or ventilation
  • Low maintenance and quiet operation
  • Operates with outside temperatures as low as -28c
  • Optimised low ambient defrost control and operation down to -15c

Available in: 14.0kW

Two PUHZ heat pumps Ecodan

Ecodan R32 FTC6 Monobloc: Pre-plumbed standard cylinders come complete with integrated hydraulic components and advance controls. They are pre-plumbed and wired for faster installation

  • Optional 2 - Zone energy efficient space heating control
  • Ready - Plumped and wired for faster installation
  • Hybrid function, for use with conventional boilers
  • Energy monitoring as standard
  • MEL Cloud Wi-fi connectivity

Available in: 150L, 170L, 210L, 250L, 300L

FTC6 Pre Plumbed 300L Solar Cylinder