This property owner tried many times to get their hot water system problem solved. Nu-Trend finally found the answer


After trying 5 different plumbers this property owner was happy to have a working hot water system

Nu-Trend Sydney Plumber Rinnai Hot Water System Repair For Swing Check Valve to Prevent loss of hot water, back charge, cross connection prevent dead legs

Our Client called us out to try and sort out a hot water system repair. They were having all kinds of hot water issues in their property. A number of years ago they were experiencing mixed hot and cold water, when she would only turn on the cold water tap. Hot water water would be coming out of the cold tap.



  • She had called a plumber and they tried to fix it, but the plumbing issue persisted returning within a few days.
  • She tried 4 other plumbers and has been experiencing the same hot and cold water issue with the hot water system for years now. 


The property was a mansion that had a commercial grade plumbing set up similar to a large city building. It had a plant room with commercial grade plumbing that had hot water circulating pump systems. This made isolating any issues even more difficult than normal. There could be all kinds of pipes or things installed in rooms or hidden wall valves with pumps etc.



On inspection we found a Spring Check Valve installed but it should have been a Swing Check Valve. The  Swing Check Valve had been replaced, so the property owner and every other plumber assumed it wasn’t the issue,  but, this type of valve is actually not designed for commercial hot water set ups and was obviously failing due to the mechanical set up of the valve. The return line always stays hot for instant hot water hence it causes the springs to fail in a Spring Check Valve. It’s actually a Legal requirement to install the right valve, it’s not necessarily a dodgy plumbing job, but it’s just a job that should have been done with a little bit more knowledge and care. This is why it is so important to choose an experienced plumber like Nu-Trend



So in this instance a Swing Check Valve needs to be installed and needed to prevent the loss of hot water, back charge and the cross connection prevents dead legs. What was happening with the use of the wrong valve was that the hot water was back charging through the cold water line of the house.



Local | Licensed | Insured

HIA Home Owners Insurance Logo


Protection for your renovation project.

Contract a local Sydney renovator.


A qualified and licensed builder.

INSURED $20,000,000

Public liability insurance for peace of mind.

Drainer  |   Gasfitter  |  Plumber  |  LP Gasfitter 

 Kitchen, Bathroom and Laundry Renovator

Nu-Trend is a renovations company in Sydney that is available 7 days a week. With 15 years experience, the Directors Rob and Rick are hands-on, and provide a personalised service that is fully licensed, insured and qualified.

You can check online with the NSW Department of Fair Trading here


All the work carried out by Nu-Trend is AS/NZ3500:2018 compliant. It is the Australian Standard for Plumbing and Drainage in NSW as set down by Standards Australia and the Australian Building Codes Board. They give the plumbing industry technical direction to enable compliance with required regulatory frameworks.

The Nu-Trend service guarantee

A personal, written, committment.

Rick and Rob are the hands-on Directors for Nu-Trend Plumbing. Rather than hire sub-contractors and manage their business from a distant office, they are on the tools, at your site & working towards delivering your bathroom renovation or plumbing service. It means you are talking directly to the owners of the business, the guys who are accountable and responsible rather than via email or through customer service teams.

It is why they are able to provide a written guarantee that demonstrates their confidence in standing by the quality of their workmanship and the service they deliver to every single client.

They have a very single minded commitment to deliver a high level of professionalism and quality.

Nu-Trend plumbing and bathroom renovation Satisfaction Guarantee

'No Gimmicks' that's our policy

No sales tricks, guaranteed.

With so many years in the trade, the Nu-Trend team has seen their fair share of sales tricks, special offers, promotions and other gimmicks to secure business. Rather than copy what everyone else is doing they decided a long time ago to avoid all the typical gimmicks and stick to clear, upfront information and pricing, including the provision of free Quotes. 

Here are the most common sales gimmicks you will see and how they work, keep in mind there is a reason most service industries don’t disclose fixed prices.

Nu-Trend at work

Real examples, real jobs.

Rather than use lots of photos copied from Google or from bathroom suppliers the Nu-Trend team shares real life examples of their work. Take a look at some of the bathroom renovations or local plumber jobs they have done around Sydney.

Years of Plumbing experience

Nu-Trend since 2009

Nu-Trend was formed just over 10 years ago by father and son team, Rick and Michael Karagiannis.

Michael has been in the industry for more than 20 years, passing his knowledge and expertise to Rick as the family tradition lives on.

Rick has always enjoyed the finer elements design details. Not content with solving plumbing problems he soon broadened his skills to also do bathroom renovations in Sydney. A perfect match with hundreds of reviews later & beautiful bathrooms being enjoyed by hundreds of people.

Rick Karagiannis - Plumber & Bathroom Renovator

Rick Karagiannis - Plumber & Bathroom Renovator

Rick Karagiannis is a licensed Plumber, Building Renovator and Director of Nu-Trend, a Sydney Plumber and Bathroom Renovations contractor. Nu-Trend has been operating since 2009 as an independent sole trader in Sydney. Rick provides all types of services for small bathroom renovations, leaking tap repairs, hot water high-pressure jet blasting and more.