"Hello BrianDB9",
Please don`t be offended by this - I just want to clarify something that You wrote - from a Heating Engineer`s point of view - in case other Members / Readers get the wrong impression.
Also I have worded My message and highlighted words for the benefit of possibly `Non Technically minded readers`:
The 2 Zone Valves in this enquiry are not necessarily related to the Zoning requirements of Part L of the Building Regulations.
The 2 Zones requirement in Part L of the Building Regulations regarding Domestic Heating Systems for Homes with Floor Plans of `Up to 150 Square Metres` is for a Heating Zone with Thermostatic and Timed Control and a Hot Water Zone with Thermostatic and Timed Control.
The Heating System design and Installation can satisfy the `Thermostatic Zoning` of Bedrooms and other Living Areas with the use of Thermostatic Radiator Valves AND a Room Thermostat - for `Boiler Interlock`.
There is NO requirement for Homes with Floor Plans of LESS than 150 Square Metres to have 2 HEATING Zones controlled by Zone Valves and individual Room Thermostats - although the Heating must have both Thermostatic Control - including usually Thermostatic Radiator Valves and a Room Thermostat [ideally a Programmable Room Thermostat] and Timed Control.
There will never be a requirement to split a Home such as a One Bedroom Flat into 2 Heating Zones using 2 Zone Valves and the associated Pipework circuits - plus 2 Room Thermostats - it is simply not practical.
Regards,
Chris - Heating Engineer - Registered Gas Engineer - Plumber / Heating, Plumbing and Gas Contractor
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