Harpenden Passivhaus
Project Description
We are building a replacement dwelling on the site of an old bungalow. The new-build will be an all-electric timber frame 4 bedroom Passivhaus Plus using the βhomes as power stationsβ concept. This means it generates much more electricity than it uses and it can operate βoff-gridβ without need for grid electricity supply for much of the year, saving any excess in its battery system and further excess sold back to the grid. It affords the occupiers a warm and comfortable environment with constant fresh air. The designers bere:architects also designed our RIBA award-winning project Max Fordham House.
This property is also one of the first installs in the UK of a Pichler PKOM4 fully integrated 2 stage air source heat pump hot water cylinder with MVHR, heating and cooling through air, (air to air), heating through water (underfloor) and hot water as one item. It has been integrated into the Loxone smart home system. The property takes its water from a well and has a huge rainwater harvesting tank which supplies toilets and the washing machine. A 3 stage waste water recycling centre was installed to treat sewage. The resultant βgrey-waterβ is used to irrigate the garden and surrounding fields.
Light and heating sensors in the house communicate with the smart home system which automatically operates the external shutters on windows to regulate internal temperatures. Installing a sprinkler system in a timber frame house also brought complications and required integrated auto water shutoff with four water sensors around the house. If any of the bathrooms or utility room leak water, it auto shuts of water for whole house to prevent damage to the timber frame or insulation.
“Rafael was involved from the beginning and contributed useful ideas and suggestions throughout the project.”
“Iβve been very pleased with how Bow Tie have got on with the work.”
“Bow Tie are meticulous in how they do things”
“We found Rafael polite and enthusiastic, and very quick to grasp what we wanted from the build – he has great communication skills.”
βWeβre expecting a dramatic reduction in costs. We now know how much energy weβve used (in March) and we rarely have the heating on compared to this time last year in our old house.β
Interested in working with us?
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