This exclusive new build development in Cornwall has been built with no expense spared. To meet the standards required for an A rated energy efficient house a Thermia ECO 42kW ground source heat pump with 8 x 100m vertical boreholes distributed from a sealed manifold chamber. The heat pump supplies a 500L heating buffer tank and 2 x 250L heat pump optimised hot water cylinders. The buffer tank supplies the wet under floor heating system and indoor swimming pool.
The ground collector is flushed and filled with a diluted Ethylene Glycol mixture (20%). THERMOX DTX has been tested and classified as Non-Toxic 1 by an EPA 2 certified Laboratory. There is plenty of space on the site, so the ground collector had no limitations or problems in that regard.
Instant Hot Water
The heat pump is capable of storing domestic hot water at 60˚C with a secondary return that pumps the hot water around the building meaning you have instant hot water at tap outlets. This is the next best thing to having a true geothermal “heat pump”, like the ones they have in Iceland.
To increase system efficiency and performance, the Thermia Solution Controller has been specified. The web based user interface allows remote monitoring of the system with;
• Access to control strategies and interface parameters
• System overview
• Datalogging with presentation in graphical charts
• Alarm notification through e-mail or SMS
Due to the varying load conditions during the `bedding in` period (12 months), the company who installed this system provided a free service where they monitored and optimised the system remotely.
Domestic RHI Payments
As this is a self build the client was entitled to the Domestic RHI which would generate a revenue of £40,000 over the next 7 years. All things considered, this results in a significant saving, in line with or better than similar heat pump systems that have been retrofitted on older properties.