The dry trap tundish has evolved

With the launch of the latest generation of the hotun dry trap tundish, featuring push-fit ends for quick and easy installation, installer and inventor Russell Armstrong is confident that he has a product range that will meet the needs of any flow discharge application.

The innovative hotun was invented in 2015 to more easily and compliantly enable installers to discharge temperature and pressure relief valves from unvented water heaters, cylinders and boilers to drain. Now, RA Tech MD and experienced plumber Russell Armstrong has developed the next generation of the dry trap tundish, enabling installation in just a few seconds.

As creators of simple and long-term solutions that solve common heating and plumbing problems, RA Tech initially developed its first hotun dry trap tundish after Russell encountered an issue during the installation of a landlocked unvented cylinder. In wanting to run the pressure relief valve discharge to a macerator, creating a visible means of discharge and stopping foul smells coming back up, he realised there was no single product available that enabled him to do that job simply and easily.

This led to the development of the hotun as a compact, open-sided tundish design that cleverly incorporates a patented in-built non-return valve. For the first time, the hotun provided a solution that enabled installers to route discharged water from a T and P Valve to an internal local drain or waste pipe, instead of having to drill through the fabric of the building for an external route. The inclusion of the internal non-return valve also eliminates the risk of odours returning from the foul drain.

Officially accepted

Since its invention, hotun has become officially accepted for use with boilers, water heaters and cylinders by many of the UK’s largest manufacturers including Worcester Bosch, Vaillant, Ideal, Intergas, Glow-worm, Ariston, Navien and Fabdec.

Throughout the development process, RA Tech understood that providing reassurance about product performance would be key to its success. Therefore, the company put compliance at the heart of its design, ensuring it had the potential to meet all necessary water regulations in one unit, reducing potential issues for installers and helping them to follow best practice more easily.

For example, regulations require the end user to be able to see the water being discharged from the T and P Valve because it acts as a warning sign that there is something wrong with the installation. This is why hotun has an open-sided design, allowing the installer or service engineer to easily diagnose historical discharges. Any discharged water can be easily seen in the upper chamber of the tundish, eliminating any doubt that a loss of system pressure has been due to the water escaping via the T and P Valve.

In all, there are seven regulatory requirements that hotun has been designed to help meet and these include those outlined by Building Regulations G3 relating to the safe discharge of water, temperature resistance and the elimination of foul air.

Speedy fit

Following hotun’s success over the past three years, RA Tech has further invested in its development to deliver a new generation dry trap tundish. The latest hotun sf range now features JG Speedfit’s inlet technology.

The new range includes the hotun sf and hotun hiflo sf (both available in black and white), hotun xlsf and hotun shield sf. The addition of the new push-fit ends speeds installation, providing an easy and simple solution for boilers, as well as small and large unvented cylinders. The range offers 15 and 22mm push-fit sizes on the inlet and 22mm compression and 32mm push-fit on the outlet.

Crucially, the hotun sf range is WRAS approved with air break to drain designation, having been independently tested for flow rate by UKAS test house Kiwa. Not only is the product able to cope with trickle and low volume flow discharges, it now boasts flow rates of 16 litres per minute for hotun sf (15/22), 25 litres per minute for the hotun hiflo sf (15/32) and 40 litres per minute for the hotun xlsf (22/32) model.

This latest development, says the company, will ensure that there is a hotun to suit a full flow discharge for every application.

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