On 13/03/2018 15:21, Andrew wrote:
On 12/03/2018 22:03, John Rumm wrote:
On 12/03/2018 15:47, Cynic wrote:


I think
there's a requirement for building regs approval for swapping a
vented one now as it comes under conservation of energy but iirc
prelagged complies as long as the temperature controls are up to date
and immersion stat is compliant.

It also comes under G3 - where the proper venting requirements,
sanitation protection, and thermostatic mixing requirements are
specified.

https://www.planningportal.co.uk/inf...ter_efficiency




What happned to the thermostatic control that limits the temp at the
tap to no more than ?50. Did this ever become a building regs
requirement ?.

From the doc above:

Prevention of scalding
3.65 The hot water supply temperature to a bath should be limited to a
maximum of 48°C by use of an in-line blending valve or other appropriate
temperature control device, with a maximum temperature stop and a
suitable arrangement of pipework.

and also:

Prevention of excessive temperatures
3.64 Where the operating temperature of domestic hot water in the
storage vessel in a dwelling is capable of exceeding 80°C under normal
operating conditions (a situation that may occur in vessels used as heat
stores and those connected to solar heat collectors or solid fuel
boilers that do not have intervening controls between the boiler and the
vessel containing the hot water) the outlet from the storage vessel
should be fitted with a device, such as an in-line hot water supply
tempering valve in accordance with BS EN 15092:2008 Building Valves.
In-line hot water tempering valves, to ensure that the temperature
supplied to the domestic hot water distribution system does not exceed 60°C.


--
Cheers,

John.

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