What is the TMV2 TMV3 Scheme?
The TMV2 and TMV3 Schemes are accreditation programmes designed to classify thermostatic mixing valves (TMVs) by their suitability for installation in certain buildings. These valves are subjected to a number of tests, which are performed by independent group BuildCert, and are granted TMV2 or TMV3 status only if they are able to reliably limit the maximum temperature of water passing through them.
TMV2 certification means that a product has passed a number of tests and is considered suitable for installation in domestic properties. Since April 2010, British building regulations have imposed a limit on the maximum temperature of hot water in bath taps and bidets. This is possible through fitting a thermostatic mixing valve, which imposes temperature limits by adjusting the mixture of hot and cold water until it meets that chosen by the user, cutting off the water flow entirely if it is unable to do so. These regulations have been in effect in Scotland since May 2006 and are required in any newly built property or bathroom renovations where a bath or bidet is moved or replaced. Purchasing a TMV2 compliant valve is an assurance that a new bathroom will meet the requirements of these regulations and will be as safe and comfortable as possible for any potential bathroom user. Where a valve is certified as meeting TMV2 regulations, HeatandPlumb.com describes them as such on their product page, making these an ideal choice for any home. This also applies to TMV3 suitable valves, which are detailed below.
The TMV3 Scheme enforces an even higher level of testing, as it is specifically intended to classify valves for healthcare uses in the UK. These tests are based on the D08 specification implemented by the NHS, which demand that a valve is capable of consistent water pressure and temperature even while the hot and cold water supply it receives may vary. They must also meet certain standards of reliability in order to be suitable for use in a healthcare capacity. If a valve is able to pass all the required tests, it is granted a certificate of TMV3 status for five years and added to a regularly updated list at BuildCerts website which also lists TMV2 units. When this period expires, it is the manufacturer's responsibility to reapply for TMV3 status, which will be granted if the product is found suitable during retesting.
Hot water safety is one of the main concerns for anybody when buying and installing new bathroom products. Thanks to BuildCert's third party testing, you can be assured that your TMV2/TMV3 purchase is suitable for whichever purpose you require. HeatandPlumb.com is proud to offer these certified products, alongside the rest of our range, at highly competitive prices; a safe bathroom needn't be a costly one.