OIL-FIRED RANGE COOKER PROVIDES FOUR-ZONE UNDERFLOOR & RADIATOR HEATING
PLUS MAINS PRESSURE HOT WATER
Water interface system is very economic and responsive, while keeping whole home very comfortable
Bob and Marion Reason are using an oil-fired range cooker to provide mains pressure domestic hot water and four zones of energy-efficient underfloor and radiator heating for their stone cottage in Cornwall. Honeywell wireless controls, cylinder thermostats and control valves are used throughout to maximise comfort, energy efficiency and speed of response.
“The entire installation was provided by the bespoke heating specialist, Stove Shop,” said Bob Reason. “A Sandyford cooker and their own ‘Casaverde’ water interface cylinder ensure the whole system is very economic and responsive, while keeping our whole home comfortable.”
The two underfloor heating and two radiator heating zones are each regulated by a Honeywell CM60RF wireless programmable thermostat. Being wireless, they required no cabling and can rest on a surface or slot into a wall bracket. The Honeywell wireless receivers (one per zone) operate Honeywell valves on the underfloor heating manifolds or radiator circuits, as appropriate.” Each CM60RF is capable of six time/temperature changes per day.
The system is designed to maximise energy efficiency and minimise firing of the Sandyford’s boiler to prolong its life. Hot water from the Sandyford enters the top of the insulated cylinder and returns from the bottom. Domestic hot water at mains pressure is heated by passing through a coil in the top of the cylinder. The draw-off temperature is 75 degrees C, but is blended to provide 45 degrees C at the taps. “We’re delighted that the hot water is always comfortably hot but cannot scald, having experienced dangerously hot water while staying in someone else’s home”, commented Bob Reason.
Whereas the radiator heating circuits are fed by the boiler, water for underfloor heating is drawn from storage in the bottom third of the cylinder. Efficiency is assisted by accurate temperature regulation of the cylinder using Honeywell immersion thermostats and the relatively low draw-off temperature for underfloor heating – about 60 degrees C, blended down to deliver 50 degrees C to the manifolds. This ensures there are no large cycles of depletion and recovery within the cylinder. The lower temperature is also safer than is customary in conventional underfloor systems, where the boiler links with the manifolds directly.
Stove Shop is at 7 Pike Street, Liskeard, Cornwall PL14 3JE.
Tel: 01579 345018. Fax: 01579 345601. Email: sales@stoveshop.co.uk
Web: http://www.stoveshop.co.uk/
Details of Honeywell comfort controls are available from freephone 0800-521121, email literature@honeywell.com and at http://www.honeywelluk.com/
