SuperHome Database

Glemsford, New Cut

House Summary

Nicholas and Ann Butt

House Type:
1850 Weavers Cottage - end of terrace

Carbon saving:
79% - SuperHomes Assessed  

Total invested:

  • Air to Water Heat Pump

Measures installed:

  • Double Glazing
  • Draught-proofing
  • Heat Pump (Air Source)
  • Heat Pump (Ground Source)
  • Internal Wall Insulation
  • Loft Insulation
  • Low Energy Appliances
  • Low Energy Lighting
  • Renewable Energy Supply
  • Roof Insulation
  • Solar PV Panels
  • Solar Water Heating
  • Wood Stove

Upcoming events

Early interest in Open Days encourages SuperHome owners to host more events. If you'd like to visit this property please contact the owner and let them know. SuperHomers are often happy to respond to questions about their refurbishment project by email between times. Please read ‘more on contacting this SuperHomer’ before you make contact.

Personal story:

I am a broadcast engineer, Ann is an A level maths teacher. I used to design Crop intervention and drying systems and am qualified as a software engineer. Our ancient stone house in Italy has also been modified –  there we can go on /off Grid at the touch of a switch.


The idea for the retrofit was suggested by the RSA (I am a fellow). I also did it because I can, (we had a Solar powered farm in Australia 30 years ago including power, water pumping and flour grinding). I didn’t want someone on the other side of the world to have the ability to switch off my gas heating . I wanted to a) be off grid in the case of power cuts b) to reduce our energy bills and c) to get my head below the “CO2 parapet”, as we fly a few times a year.

Measures installed in detail:

• Windows – double glazed (new windows double glazed to triple glazed rating)
• Draught proofing
• Airsource heat pump for heating and hot water
• Groundsource heat pump for central and winter water heating
• Internal wall insulation
• Loft insulation
• Low energy appliances
• Low energy lighting
• Foil roof insulation
• 1.28 kWp Photovoltaic panels with tie grid inverters
• Buying electricity from renewable sources (hydro power)
• 4 sqm Solar hot water panels
• Wood stove with back boiler provides secondary heating

Common questions and answers for this SuperHome

Would you recommend a ground source or air source heat pump?+

We are in the sixth winter relying on the air source heat pump and I must say it is a resounding success. We just replaced a gas boiler in an old central heating system with a ground source and an air source heat pump. The ground source works well but unfortunately not enough pipe was put in the ground (double loop to 57 metres). The expense of adding more loops was far higher than experimenting with air source and we made the right decision with air source. The ground source is great for a boost on very cold evenings though.

What back up do you use for the heat pump when it is sub zero outside?+

We back up our heat pump with a wood stove in sub zero conditions. This also heats our water for showers etc.

How do you get hot water from the heat pump, solar thermal and wood stove?+

The easiest way to heat water from multiple sources is to use a tank with multiple heat exchange coils. Tanks with 3 coils are easily obtainable. My Superhome uses the original tank with one coil.

I use solenoids in conjunction with time switches and thermostat to control flow from each device though the woodstove is always free flowing to the tank from the back boiler, so when the hot water is heated from the air or ground source heat pumps it acts as an extra radiator. It all works very well and I can heat water 6 different ways.

How does your hot water circulate – does it use convection?+

I cannot use convection to circulate hot water from the air / ground source pumps or solar water heating. As the pipes go from the garage to the attic, entry is well above the tank. We use 4 pumps in total with 2 valves and one timer / 1 thermostat. Only 1 pump is ever on at a time, consuming 20 watts. I did start to develop a bespoke adaptive controller using a PIC chip but this proved to be unnecessary.

Contact this homeowner

Assessment types

SuperHomes Assessed

A home that has been visited and assessed by us and confirmed as reaching the SuperHome standard, which demonstrates a 60% carbon saving.

Homeowner Reported

Information has been provided by the homeowner about their home and energy use prior to the installation of measures and following their installation which demonstrates a carbon saving. This information has not been verified.

Remote Assessed

The homeowner has provided information on their home including what measures have been installed which has enables an assessor working on our behalf to assess their carbon savings. This home has not been visited to verify the measures installed.


This home has not been assessed, but the homeowner has reported what measures have been installed. It may be that this home is awaiting assessment.