Trouble shooting why do I not have hot water

Trouble shooting why do I not have hot water

Why do I not have hot water?

May, June and July are the coldest months on the Gold Coast, and no-one wants to start the day with a cold shower in winter. Unluckily for some clients of Whywait Plumbing who are not Service Partners it is in these months they go to the shower and question why do I not have hot water?

Unfortunately, hot water systems are a case of out of sight out of mind. Continually where hot water systems are concerned, there were warning signs that there was a problem. Over the summer months, hot water problems are overlooked as the demand for higher temperature; hot water is not a critical consideration.

Several warning bulletins in Queensland have been issued by the QBCC and Queensland Health advising homeowners that their hot water systems need to be maintained and serviced frequently.

AS/NZS 3500.4:2018 Heated Water Services

The Australian standard that all hot water installation is based around is AS/NZS 3500.4:2018 Heated water services that are an integral part of the National Construction Code of Australia issued by the Australian Building Codes Board and it is all legal requirements in Queensland.

In AS/NZS 3500.4:2018 there is Appendix M which provides guidelines for the operation and maintenance of your hot water system which is below:

M1 SCOPE
This Appendix provides guidelines for the operation and maintenance of a heated water system.
M2 GENERAL
In order to ensure maximum performance and length of operation, water heaters should be inspected periodically.
M3 MAINTENANCE OF HEATED WATER SERVICES
Heated water services should be maintained in accordance with the following:
(a) Water treatment units: Where installed, water treatment units should be inspected periodically to ensure proper operation.
(b) Water vessels and tanks: All vessels and tanks should be inspected and cleaned periodically, and in accordance with any requirements of the regulatory authority.
NOTE: The frequency of periodic cleaning depends upon the quality of the supply water, design, materials of construction and the pipe system. Combinations of materials giving rise to corrosion should be avoided.
(c) Valves: The following valves should be inspected periodically to ensure proper operation:
(i) Temperature/pressure-relief valves.
(ii) Expansion control valves.
(iii) Thermostatic mixing valves.
(iv) Tempering valves.
(v) Other associated valves/devices.
(d) The requirements of AS/NZS 3666.2, where applicable.

Common reasons for why do I not have hot water

why do I have no hot water so call Whywait PlumbingBelow are listed the most common reasons we attend to clients jobs who call up to as why do I not have hot water? Listed are elementary troubleshooting ideas that you can undertake yourself to resolve or understand why your hot water is cold:
  • blown fuse or circuit breaker – replace the fuse or reset the circuit breaker and if it blows again it’s probable there is a fault with your element or thermostat, and you need to call Whywait out to repair
  • Energex relay switch failure – this is not the easiest to detect but if you are on off-peak rates and there are no obvious electrical faults or water leaks then its worth a phone call to your energy supplier to check whether the relay switch has failed to activate in your area
  • defective relief valve – most relief valves on the side of the HWS only have a life span of around 3-5 years. Still, they can jam open so first check if you see water running from it by pulling the lever up and then easing back down again. If water continues to run then you need to call Whywait out to service the unit
  • no water at all – this is when you wake up turn the tap on and cold water flows, but there is no flow from the hot water. Frequently this a failure of the non-return or isolating valve and a quick way to check is to turn the handle on the valve all the way off and then all the way back on. In many cases, the hot water will simply begin to flow again. However, if there is still no flow you need to call Whywait out for repairs
  • water fluctuation from hot to cold – there are several reasons for this occurring, but the most common is a faulty tempering valve. There is nothing you can do to solve fluctuation other than call Whywait and read our information on tempering valves
  • water leaking from hot water tank – there is only a maximum of 7 possible points on an HWS tank where there are joints that can possibly leak. Only 2 of those are concealed in the housing so if the water is leaking from the tank and its not from the visible water connections you need to call Whywait for service to check the HWS. In all likelihood, if the hot water tank is more than ten years old then its a 50/50 chance you need a new one installed

DIY warning

The above reasons are the most common problems you will experience with why do I not have hot water. As you can see above, there are only a few simple DIY solutions when you have no hot water.

A word of warning though. Please never open up the housing near the bottom of the tank where the electrical connections are as they are all live wires inside there and therefore very, very dangerous.

Whether you have a solar, heat pump, gas or electric hot water system they do need periodic maintenance so for all hot water problems call Whywait Plumbing now on (07) 5580 4311 as we guarantee a same-day rapid response for hot water problems.

Hot Water Burns Like Fire

Hot Water Burns Like Fire

Queensland law since 1995 has been that hot water delivered to bathrooms be regulated so that it does not exceed  50°C. The most common method to achieve this is by installing a tempering valve.

At 60°C, a severe burn can happen in 1 second.
At 55°C, a severe burn would take 10 seconds.
At 50°C, a severe burn would happen after 5 minutes.

tempering valve gold coastIf your hot water unit has a valve that looks like the one pictured on the right, then you have a tempering valve installed. The most common valve installed has a blue cap, but valves used on gas units frequently have a green cap and those on solar or heat pump units have an orange cap.

It is almost a guarantee that your valve has never been serviced as most homeowners do not realise they even had such a device or that they are required to be tested and certified annually. Very simply a tempering valve blends hot and cold water to deliver hot water at a constant temperature and thus reduces the risk of scalding accidents.

Recent litigation places a deed of care to ensure the safe delivery of hot water in domestic situations. Very simply this means you should be having the tempering valve serviced annually whether you are a homeowner or a property investor or a real estate property manager. To ensure your hot water delivery is safe, you need an annual report signed by a licensed plumber that states:

  1. the model, manufacturer and identification of the tempering valve installed
  2. the temperature of the hot water recorded during the test
  3. details of the test undertaken, details of what maintenance was undertaken and what parts were replaced
  4. the location of the valve in the property
  5. a reference to the test method undertaken being compliant with AS 4032.3, Appendix C

Duty of care provisions applies to us all and without an annual test and a written report you leave yourself liable if anyone suffers a burn from your hot water. Most electric hot water units heat water to 70°C, so that has the potential to produce a severe burn in 1 second without a correctly working tempering valve.

Whywait Plumbing is contacting clients to book in compliant testing, maintaining and reporting of your tempering valves but if you have any concerns over the temperature of your hot water, contact us now to schedule your service.

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