HIUs

Delta TMV

Intamix Delta for energy saving lower temperature hot water systems

The Intamix Delta range of thermostatic mixing valve has been designed and engineered for heat networks where the maximum distribution temperature from the HIU is 50°C. In these installations
standard TMVs that are approved to BS EN 1111: 2017 or BS EN 1287: 2017 may not failsafe when used for bath, shower or wash-hand basin applications. These valves will operate with just 5°C ΔT between the mixed outlet and the hot inlet.

Our new Intamix Delta range accommodates these lower inlet
temperatures whilst providing Intatec’s proven anti-scald protection for safety and peace of mind.

  • Specifically designed for heat networks where the maximum distribution temperature is 50°C from the HIU
  • A 5°ΔT between the hot inlet and mixed outlet ensures the valve will still achieve cold water failsafe even with lower inlet temperatures
  • Flat face unions allow for easy maintenance of the valve
  • High flow rates with low pressure drops
  • Integral check valves and strainers

Inta Delta TMV

  • DeltaMX 15mm thermostatic mixing valve
  • DeltaMX 22mm thermostatic mixing valve
  • DeltaMX 15mm thermostatic mixing valve with isolation valves
  • DeltaMX 22mm thermostatic mixing valve with isolation valves

Technical data sheets available on request.

 

Specifically designed for heat networks where the maximum supply temperature is approx. 50°C .

A 5°ΔT between the hot inlet and mixed outlet ensures the valve will still achieve cold water failsafe even with lower inlet temperatures.

TMVs that are approved to BS EN 1111: 2017 or BS EN 1287: 2017 may not failsafe when used for bath, shower or wash-hand basin applications.

Delta Intamix Showers

Specifically designed for heat networks where the maximum supply temperature is approx. 50°C

Delta Thermostatic Single Outlet Bar Shower
Product code DT10031CP

Technical Specification

Max Inlet Pressure (static):  5 Bar
Min Inlet Pressure (dynamic):  0.2 Bar
Max Inlet Temperature:   60°C
Max Pressure Differential:  5 : 1
Temperature Stability:  +/-2°C
Minimum pressure differential*  5° C

*between hot inlet and mixed outlet to achieve cold water failsafe.

Delta Thermostatic Dual Outlet Bar Shower with Telescopic Riser, Overhead Soaker & 5 Function Handset
Product code DT10032CP

Technical Specification

Max Inlet Pressure (static): 5 Bar
Min Inlet Pressure (dynamic): 0.4 Bar
Max Inlet Temperature: 60 °C
Factory pre-set temperature with Stop: 38°C
Temperature Stability: +/-2°C
Minimum pressure differential* 5° C

*between hot inlet and mixed outlet to achieve cold water failsafe.

Delta Thermostatic Bath Shower Mixer with Flexible Slide Rail Kit & Deck Mounting Legs
Product code DT30024CP

Technical Specification

Max Inlet Pressure (static): 5 Bar
Min Inlet Pressure (dynamic): 0.2 Bar
Max Inlet Temperature: 85 °C
Temperature Stability: +/-2°C
Minimum pressure differential* 5° C

*between hot inlet and mixed outlet to achieve cold water failsafe.

Heating and Plumbing Manufacturers

Visit Intatec for Intamix Delta Thermostatic Mixing Valves and more

Go to Intatec.co.uk

Delta Thermostatic miXING Valve (TMV) In Depth

Find out more about the importance of thermostatic mixing valves, regulations and the benefits of installing them

Heat Networks are becoming more of an important factor is the Governments Carbon Net Zero target. In low density areas, they can be low cost and low carbon heating option. Driven by low carbon technologies, such as Air Source Heat Pumps and Ground Source Heat Pumps, primary temperatures are becoming lower. In most cases, 55°C is being used as the primary temperature to “power” the heat interface unit (HIU).

As energy costs continue to rise, we are all looking to reduce our energy use. For Heat Networks, reducing temperatures is an obvious course of action. It makes good sense, because on instantaneous hot water products, why produce hot water at 55C or even 60C just to mix down at each outlet? Using less energy and reducing CO2 emissions is the common message to everyone globally.

Documents giving guidance on Heat Networks, such at CIBSE CP1 Heat Networks 2020, is calling for the DHW supply to be delivered from the HIU at 50°C. Which begs the question, what happens to the Thermostatic Mixing Valves (TMV), showers and bath shower mixers? This is a question not currently addressed by our industry.

The scalding risk with current technology.

This issue is not currently addressed by our industry. Manufacturers and design consultants have not recognised this issue and installers are still fitting thermostatic mixing valves (TMVs) at outlets (baths, taps and showers) that are simply not capable of operating and providing protection against scalding, because these thermostatic valves cannot operate in low temperature hot water systems.

The implication is that all low hot water systems will have thermostatic mixing valves and showers that do not work.

Seems a strange question, however, when you come to understand the way TMVs work, it is a valuable question worth asking.

Thermostatic mixing valves (TMVs) were introduced into the market for safety and prevention of high temperatures at point of use. The UK Building Regulations Part G states that mixing valves must be compliant with BS EN 1111 (high pressure) and/or BS EN 1287 (low pressure) to reduce the risk of scalding. Guidelines were laid down by BuildCert for manufacturers to benchmark product design under the TMV2 scheme.

The issue is SAFETY.

Typically, a normal TMV works by blending the Hot Water and Cold Water, to produce a set temperature to the tap/shower/bath mixer. However, the different between the incoming Hot Water and the outgoing Mixed Water must have a 10ΔT.

By installing TMV2 accredited mixing valves we are protecting our customers and family, eliminating the chance of scalding incidents. However, if for any reason the Cold Water is interrupted to the TMV, then there is the strong possibility that the Failsafe mechanism inside the TMV will not work, thus allowing 50°C to pass straight through the valve.

 

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