Thermostatic mixing valves and water safety - Revision history

Editor at 07:43, 18 May 2023

2023-05-18T07:43:18Z

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−	Whether a homeowner or ~~landlord~~ or a local council, building owners have a duty of care for those living, working, or using their facilities, which is why thermostatic mixing valves (TMV) play a crucial role in all plumbing systems. It is imperative that some form of TMV be specified for every hot water system. The main benefit of a TMV is keeping water at a safe temperature, which therefore prevents scalding and helps stop the build-up of harmful Legionella bacteria. This is achieved by mixing hot and cold-water streams together to ensure a safe temperature at the outlet.	+	[[File:CIAT AT 144 TMValve Bateman RWC banner.jpg]]
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		+	Whether a homeowner or land-lord or a local council, building owners have a duty of care for those living, working, or using their facilities, which is why thermostatic mixing valves (TMV) play a crucial role in all plumbing systems. It is imperative that some form of TMV be specified for every hot water system. The main benefit of a TMV is keeping water at a safe temperature, which therefore prevents scalding and helps stop the build-up of harmful Legionella bacteria. This is achieved by mixing hot and cold-water streams together to ensure a safe temperature at the outlet.

	The type of TMV required for an individual application will vary greatly on what kind of building the specification is taking place in, as domestic and commercial buildings have a different requirement to buildings in the healthcare sector.		The type of TMV required for an individual application will vary greatly on what kind of building the specification is taking place in, as domestic and commercial buildings have a different requirement to buildings in the healthcare sector.

Editor at 06:02, 18 May 2023

2023-05-18T06:02:59Z

← Older revision		Revision as of 06:02, 18 May 2023
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	The above article includes an extract of "Do not get your ABCs confused – all you need to know about TMVs, PRVs and the Tenant Valve" published in the AT journal, issue 144, Winter and written by Richard Bateman, Product Marketing Manager, RWC		The above article includes an extract of "Do not get your ABCs confused – all you need to know about TMVs, PRVs and the Tenant Valve" published in the AT journal, issue 144, Winter and written by Richard Bateman, Product Marketing Manager, RWC

−	-- [[User:CIAT\|CIAT]]	+	--[[User:CIAT\|CIAT]]

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =

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Whether a homeowner or landlord or a local council, building owners have a duty of care for those living, working, or using their facilities, which is why thermostatic mixing valves (TMV) play a crucial role in all plumbing systems. It is imperative that some form of TMV be specified for every hot water system. The main benefit of a TMV is keeping water at a safe temperature, which therefore prevents scalding and helps stop the build-up of harmful Legionella bacteria. This is achieved by mixing hot and cold-water streams together to ensure a safe temperature at the outlet.

The type of TMV required for an individual application will vary greatly on what kind of building the specification is taking place in, as domestic and commercial buildings have a different requirement to buildings in the healthcare sector.

It is recommended that in domestic and commercial environments, a TMV2 approved valve is specified, and safely installed, tested and maintained to current standards. These valves are designed to reduce the risk of scalding at outlets, while minimising the potential build-up of Legionella bacteria in the pipework that is fed from the outlet side of the valve to the tap. They are typically found under sinks and basins, and never more than 2m away from the outlet they are serving. For buildings occupied by the healthcare sector, such as hospitals, a TMV3 needs to be specified, which functions the same way as a TMV2, but undergoes more rigorous testing, both at the point of installation, as well as every six months after initial sign- off. This is to ensure the safety of the end users, who are likely to be more vulnerable to both scalding and the potential harmful infection from Legionella bacteria.

Where a TMV2 can typically only work with water pressures of 5 bar or below, a TMV3 is safe to work with 10 bars of water pressure.

[http://apps.who.int/iris/bitstream/handle/10665/76145/9789241548106_eng.pdf Water safety in buildings], published by the World [https://www.designingbuildings.co.uk/wiki/Health Health] Organization in 2011, defines thermostatic mixing valves as: ‘Tempering [https://www.designingbuildings.co.uk/wiki/Valves valves] that are typically temperature-activated. Used to mix hot and cold [https://www.designingbuildings.co.uk/wiki/Water water] to achieve a predetermined outlet temperature, and that are fitted between the [https://www.designingbuildings.co.uk/wiki/Water water] [https://www.designingbuildings.co.uk/wiki/Heater heater] and the [https://www.designingbuildings.co.uk/wiki/Points point] of use to control the distribution temperature. Slightly different temperature ranges are used in some countries.’

[https://www.bsria.com/uk/product/vBL33D/legionnaires_disease_operation_and_maintenance_log_book_bg_582015_a15d25e1/ Legionnaires' Disease - Operation and Maintenance Log Book (BG 58/2015)], written by Reginald Brown and Salim Deramchi, and published by [https://www.designingbuildings.co.uk/wiki/BSRIA BSRIA] in May 2015, defines a thermostatic mixing valve as a: ‘Mixing [https://www.designingbuildings.co.uk/wiki/Valves valve] in which the [https://www.designingbuildings.co.uk/wiki/Temperature temperature] of the [https://www.designingbuildings.co.uk/wiki/Water water] at the outlet is pre-selected and automatically controlled by the [https://www.designingbuildings.co.uk/wiki/Valves valve].’

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The above article includes an extract of "Do not get your ABCs confused – all you need to know about TMVs, PRVs and the Tenant Valve" published in the AT journal, issue 144, Winter and written by Richard Bateman, Product Marketing Manager, RWC

-- [[User:CIAT|CIAT]]

= Related articles on Designing Buildings =

* A guide to installing thermostatic mixing valves: what, why and how.
* Domestic hot water.
* Mechanical, electrical and plumbing MEP.
* Ofwat.
* Pipework defects, ventilation and airflow rates.
* Pipework.
* Pressure independent control valves.
* Pressure-relief valve.
* Pumps and dewatering equipment.
* Radiator.
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* Thermostatic mixing valve.
* Types of valve.
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* Water safety plan WSP
* Water.

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