Two 16kW heat pumps in cascade
for a large house in Barnet
A house with a heating demand one heat pump could not meet. Two Samsung Gen 7 16kW units run together, 32kW in all, staged on and off by their own controls.
- Our own job, photographed on the day
- Free survey and a fixed written price
- MCS certified, NICEIC approved electrics
Accredited, and fitting the brands you know
We designed and installed two Samsung Gen 7 16kW high temperature heat pumps in cascade for a large detached house in Barnet EN4, giving 32kW of combined output. Samsung's cascade controls stage the two units on and off, share the running hours between them and keep the house warm on one if the other is being serviced.
Hot water comes from a 460-litre indirect unvented cylinder with a 28.54kW coil, and a 200-litre buffer tank separates the heat pumps from the heating circuits. The units run on R290 and have a SCOP of 4.51.
How the job was done
Step by step, in the photographs taken on site.
-
1
Why two machines, not one big one
The heat loss survey put the house's demand above what any single domestic heat pump delivers. Two 16kW units in cascade meet it, and on milder days only one needs to run, which is more efficient than one oversized unit at part load.
-
2Each one can be isolated
Flow and return to each unit are in insulated copper with isolating valves on each leg. Either unit can be shut down and worked on while the other keeps the house warm.
-
3Hot water at scale
A 460-litre cylinder with a large 28.54kW coil recovers quickly after heavy use, and the 200-litre buffer with a secondary pump keeps the system hydraulically stable however many zones are calling.
Every photograph from the job
3 photographs, no faces, nothing staged.
Thinking about a heat pump?
What this job involved, applied to your own house.
Air source heat pumps
Whole-house heating with the £7,500 grant
Air source heat pumpsWhat a heat pump costs
Ten real quotations, before and after the grant
What a heat pump costsHeat pump or air conditioning?
Which one a house actually needs
Heat pump or air conditioning?Air-to-air heat pumps
Heats and cools, room by room
Air-to-air heat pumpsBarnet EN4: questions about this job
What is a cascade heat pump system?
Two or more heat pumps connected to work as one, with controls that bring each on as the demand rises. It suits large houses whose heat loss is beyond a single unit, and it gives you a backup if one unit fails.
Does the £7,500 grant cover a cascade system?
The Boiler Upgrade Scheme has a capacity limit per installation, so eligibility for a large system is checked case by case at the survey.
More of our finished work
Other jobs we have photographed. Tap one for the project.
Air conditioning
N11
New Southgate
Daikin multi-split condenser
Wall-mounted on brackets rather than stood on the ground, which is usually what a narrow side return leaves you, and the refrigerant lines dropped in a single trunked run.
Read the case study
Heat pump and solar
N21
Winchmore Hill
Air source heat pump with roof-mounted solar
The panels sit across the rear pitch and the heat pump at the side of the house, which is the pairing that lets the pump run on its own generation through the middle of the day.
Read the case study
Heat pump
N22
Wood Green
Samsung monobloc air source heat pump
Stood on a levelled base built up out of the border rather than on soil, so the feet stay out of standing water and the unit does not settle out of level over a winter.
Read the case study
Heat pump
EN3
Enfield
Samsung monobloc air source heat pump
Set tight against the flank wall on anti-vibration feet, where it takes up none of the usable garden and the pipe run to the cylinder stays short.
Read the case study
Heat pump
EN3
Enfield
Vaillant aroTHERM plus 7 kW air source heat pump
Stood on rubber anti-vibration blocks on the existing patio slabs rather than on a new base, against the rear fence and beside the drainage the house already had.
Read the case study
Heat pump, solar and battery
N15
Tottenham
Air source heat pump with solar and battery storage
The whole electrical side on one wall: inverter, battery modules and every isolator in reach, with the conduit dressed in straight runs so a fault years from now can be traced without stripping the wall.
Read the case study
Solar and battery
NW2
Cricklewood
Solar panels on ballasted frames, flat roof
Low-tilt frames standing on the pebble finish of a new-build flat roof and held down by weight, so nothing is fixed through the waterproofing, with a clear strip left along the parapet to walk and work from.
Read the case study
Heat pump
NW1
Camden
Samsung monobloc air source heat pump
Levelled on packers on an existing tiled patio rather than bolted through it, so the tiling stays intact and the unit still sits dead flat.
Read the case study
Heat pump
N12
North Finchley
Samsung Gen 7 12kW high temperature heat pump
On wall brackets on the side of the house, clear of the ground, which keeps the side passage usable and the coil away from leaves and splashback.
Read the case study
Heat pump
E11
Leytonstone
Samsung monobloc air source heat pump
On its own slab set clear of the fence line, with the condensate taken away below ground level instead of being left to run across the paving and freeze.
Read the case study
Book a free heat pump survey
We measure every room, calculate the heat loss, check the radiators and the space for a cylinder, and send a written price with the grant already taken off. No cost and no obligation.
Monday to Friday 9am to 7pm, Saturday 10am to 3pm, Sunday closed
Page updated