← Back

General News, Heating & Cooling

14 Apr 2021

Why Does My Hot Water Run Out So Quickly?

A cold shower is no one’s idea of a good start to the morning! If you and your family members are noticing you are running out of hot water faster than before, it could be your water heater’s cry for attention. So, before you blame your spouse for the cold shower, understand that a hot water heater unable to keep up with demand is a red flag pointing to the need for repair. There’s no reason to continue to suffer through icy showers day after day. Some simple troubleshooting tips can help you to identify the source of the problem.

Why Does My Hot Water Run Out So Quickly?

Water Heater Tank Sizes

Make sure your tank size is adequate for the job. Tanks are rated at how many litres per hour they heat. A peak rating of 150 means 150 litres of water are heated for use in an hour’s time. Each appliance uses a certain amount of hot water to do the job. For example, an average shower requires 80 litres of hot water; a dishwasher, about 6 litres; and a clothes washer, about 7 litres of hot water per hour. In a scenario where two loads of wash are done, two showers are taken and a load of dishes is finished, a hot water tank that supplies a peak-rated 40 litres of hot water per hour will ensure that you won’t run out of hot water in the shower. In this same scenario, if you have a 30-litre peak hot water heater, your shower won’t remain hot for very long.

Sediment Build-up

In a tank water heater, the water can only take up as much space as the tank will allow. Water is not the only thing in the tank. In places with hard water, minerals accumulate in the tank. If you do not clean it out regularly, the sediment builds up in the tank and leaves less room for water. Over several years, the build-up could take several litres of space, leaving you cold when you want to be warm. At the very least, you should request maintenance services from your plumber, to clear the sediment from your water heater and plumbing. You may also want to install a home water softener, to prevent the problem of build-up in the first place.

Tankless Water Heaters

In most cases, a tankless on-demand water heater fails to supply enough hot water if the unit is too small. Electric on-demand water heaters are generally only satisfactory for one or two people. Gas-fired on-demand water heaters are more versatile, but if everyone in the household is using hot water at the same time, it won’t be able to heat up water rapidly enough to keep your shower warm. Many factors determine whether a tankless hot water heater will run cooler, and some of these include the incoming groundwater temperature and the flow rate at a specific temperature.

Inefficient Water Heater Use

No hot water heater is going to be perfect, always accommodating all of your needs. If you want to know that the hot water will be available to you, you must also tailor your use of the hot water to a reasonable level. There are many reasons to conserve water, but several of them are also related to your own convenience. Wait to wash clothes or run the dishwasher until you have a full load. Create a schedule to use those appliances at times when you are not planning to do a lot of cooking or take a long bath or shower. With a little forward thinking, you can minimize a lot of hassle.

Hot Water Overuse

What-To-Do-When-Your-Hot-Water-System-Is-Leaking

If there are multiple appliances using hot water when you are taking a shower, you will run out of hot water. Dishwashers, washing machines and even hand washing at the sink use enough hot water to make your shower quickly run out of hot water. Schedule your showers during times when there is no other appliance using hot water. If you still run out of hot water, there may be a larger problem.

Worn or Broken Equipment

Failing to arrange for regular service can lead to more than just hard water deposits in your water heater. It can also lead to broken equipment inside your water heater. For example, if your dip tube is broken, you may notice a difference in the temperature of your water. The dip tube pulls the incoming cold water to the bottom, directly to the heating element. That ensures that the water heats up faster. A broken dip tube doesn’t direct the water anywhere, just mixes cold and hot water. Be sure to schedule maintenance at least once a year to confirm that everything in your hot water heater is working properly.

Great Tips to Improve Usage

Below are some of the great tips to help you keep the hot water running when the water heater can’t keep up.

  1. Limit Your Usage. An average shower dispenses 40 litres of water every 60 seconds. If the capacity of your water heater tank is 150 litres, you can run out of hot water at any time. A water heater tank with a 70-litre capacity won’t deliver more than 43 litres of hot water. The reason is that the hot water gets diluted when the cold water gets into the tank. With this in mind, you can only use part of your hot water and not all of it.
  2. Know the Recovery Time. When your water heater gets drained, it’ll need some recovery time to dispense hot water as it once did. It usually takes minutes or hours to recover (depending on your tank size). For instance, a 70-litre tank will take about 26 minutes to refill and heat the water. To have hot water in the fastest way possible, avoid using hot water when the recovery process is not done. Allowing the recovering time to complete will make the unit heat the water quicker. Drawing water when the recovery process is still going on will add cool water to the tank. When this happens, the recovery time increases, and the water will not be well heated.
  3. Loose Connections Electric. water will stop functioning properly if the wiring of the unit becomes loose. Hence, turn off the unit and check if the entire wiring is still in place. This problem is rare to encounter, but you should also consider it.

Call Service Today

If you’ve tried some simple fixes and still aren’t getting hot water, we recommend calling a plumber to take a look. Service Today has served Sydney, Adelaide and Melbourne communities for 20 years and is one of the most trusted names in the business. Our plumbers can flush your tank, repair or replace your heating unit to restore your hot showers and your relaxation time. Contact us today to schedule a consultation.

See why we’re Australia’s most
trusted home experts.

Alex E
Alex E Local Guide • 21 reviews • 5 photos
Google Icon
Rating 1 day ago
Had an issue with our bathroom sink and these guys were great. The plumber actually tried to fix it first rather than jumping straight to replacing it, which I appreciate... More
M
Martine Farleigh
Google Icon
Rating 3 months ago
Elei was able to assist us with changing two smoke alarms and replacement of sensor light. He was able to give us a number of different pricing options, was very efficien... More
K
Kerrie Durbin
Google Icon
Rating 3 months ago
Service Today were great, punctual & professional! Marko solved the problem & we had power again in no time. Will definitely use them again
T
Ted Baldock
Google Icon
Rating 3 months ago
On Sunday evening I had a problem with our home electrical box where half the houes lost power. I had the pleasure of dealing with your wonderfull electrician Elei, who ... More
T
Tim Walsh
Google Icon
Rating 3 months ago
Electrician Mark contacted me ahead of time and arrived as promised. Explained everything about the source of our electrical fault, remedy, and cost. Completed repair pro... More
I
Ian Stapley
Google Icon
Rating 3 months ago
Great work by Service Today to power in our four smoke alarms and fix a squeaky fan. Fast, efficient, clean and friendly. Good choice for all your household needs.
G
Greg Euhus
Google Icon
Rating 3 months ago
More than happy with the service provided. Trent has done an amazing job of fault finding the issue and finding huge problems created by the previous electrician. Very p... More
L
Lora C
Google Icon
Rating 3 months ago
We had a great experience with Eli, the electrician who serviced our rental. He was friendly, professional, and took the time to clearly explain everything he was doing. ... More
Y
Yana Oborska
Google Icon
Rating 3 months ago
We have been using the Service Today since 2022.The team are knowledgeable and professional. Easy and fast booking system. Thank you to Andrew, who helped me with our pr... More
B
Barry Carmichael
Google Icon
Rating 3 months ago
Carl was friendly and efficient, he took his time to explain the possible issues with my A/C. I would definitely recommend his services.
J
Jacqueline Marinkovic
Google Icon
Rating 3 months ago
I recently had Anthony attend my property to work on the air conditioning, and I couldn’t be more impressed with his service. Anthony was extremely knowledgeable, profes... More
T
Tracey Lostroh
Google Icon
Rating 3 months ago
When our air conditioner died, we called Service Today, got an appointment and quote that same day. We accepted the quote and they supplied and fitted the new unit the v... More
R
Raina Parker
Google Icon
Rating 3 months ago
We had Brodie come to assist us with our air conditioning and electrical needs and from the get go I felt very comfortable with him as I was home alone with my baby and ... More
D
David Bell
Google Icon
Rating 3 months ago
The installation of a new air conditioner was done very professionally. First a decommissioning of a very old air-conditioner and furnace with removal of these units. Th... More
N
Nicole Lehmann
Google Icon
Rating 3 months ago
Service Today are brilliant. I am a VIP member and the benefits are fanstastic. I just had a new air condidtioner unit installed. From the booking process to the installa... More
L
Lynn Demertzis
Google Icon
Rating 3 months ago
Fantastic service. Technician was punctual, courteous and replaced the roller door motor on the spot in less than an hour. I would highly recommend them.
D
David Sullivan
Google Icon
Rating 3 months ago
Contact Service Today on Tuesday and by Thursday Kai their technician arrive on time and communicated all the way the process of installing a new roller door motor! Great... More
R
Rebecca Smoker
Google Icon
Rating 3 months ago
We had the pleasure of working with George to repair our garage doors and gate, and we couldn’t be happier with the service.He was polite, punctual, and incredibly know... More
B
Barry Shepherd
Google Icon
Rating 3 months ago
Quick respponse to faulty garage door. George was very personable and informative. He quickly assessed problem and replaced motor after power surge cooked system. All do... More
B
Brian Myers
Google Icon
Rating 3 months ago
I was having trouble with the roll a door on my carport. I rang to see if someone could come, but had to leave the carport open for 4 days. Tradie came exactly on time 7... More
R
Roman Zieba
Google Icon
Rating 3 months ago
The replacement of our roller door motor was carried in a very efficient and speedy manner. The technician Kai was polite, friendly and wasted no time in completing the j... More
C
Christine Eagles
Google Icon
Rating 3 months ago
Kai from Service Today did a great job servicing my garage door. He was punctual and very professional. He answered all my questions regarding future maintenance. Thanks... More
G
Gabriel Manfrin
Google Icon
Rating 3 months ago
Got service today to come out for a quote and install of a security system. The technician was honest, with reasonable pricing and very friendly. The workmanship was pro... More
C
Colin Lim
Google Icon
Rating 3 months ago
Steve installed a new camera, fixed camera digital date in quick time. Response time for booking was efficient and very pleased to have the CCTV issues fixed after my or... More
C
Cheryl Anderson
Google Icon
Rating 3 months ago
The guys were great setting up my cameras very efficient and patient showing me how to use them. Thank you so much.
C
Christie Belcastro
Google Icon
Rating 3 months ago
We recently had a security camera system installed by Service Today and couldn't be happier with the result. The technician arrived on time, explained all of our options ... More
M
Mario Sulliman
Google Icon
Rating 3 months ago
Called Service Today after wanting to upgrade the security around our property. The technician was friendly, knowledgeable, and didn't try to oversell anything we didn't ... More
C
Craig Smith
Google Icon
Rating 3 months ago
Excellent experience with Service Today. We had an alarm system and a few outdoor cameras installed. The technician was professional, punctual, and communicated everythi... More
C
Christine Eagles
Google Icon
Rating 3 months ago
Our home security system suddenly stopped working. Service Today was able to send a technician out quickly to investigate the issue. He was professional, friendly, and t... More
A
Andrew Kleinig
Google Icon
Rating 3 months ago
Top job by the 2 plumbers replacing our hot water system today. Very pro, cleaned up and certainly knew their stuff.
J
James Shelton
Google Icon
Rating 3 months ago
Had my hot water service replaced when the old one gave up the ghost after hrs on a Thursday night. New unit was replaced and commissioned by lunchtime Friday. Plumber (... More
S
Saman Senaratne
Google Icon
Rating 3 months ago
Had my hot water system replaced by Service Today and they did a great job! Super friendly, turned up on time, and got everything sorted quickly. The new system’s workin... More
L
Laurel Gillan
Google Icon
Rating 3 months ago
The boys arrived as they promised, on time with bright and friendly smiles, both Sam and Lachlan were extremely professional and efficient. The new shower head is AWESOM... More
P
Pam Tonkin
Google Icon
Rating 3 months ago
Fantastic service! Service Today were here early morning, let us know what the problem was and gave us a quote within a short time. New hot water service installed withi... More
C
Christy McKnight
Google Icon
Rating 3 months ago
very friendly and most importantly honest and punctual. Our hot water service started leaking on a Saturday. I was able to book a service online for first thing Monday m... More
K
Kate Evans
Google Icon
Rating 3 months ago
Very happy with the plumber & electrician who fitted my hot water system. They each were very polite and well mannered. They explained everything to me in a way that was ... More
H
Hellen Domingo
Google Icon
Rating 3 months ago
Last night I chatted with someone at Service Today Adelaide about our blocked toilet. Plumber arrived this morning and my husband & I were very impressed with their prom... More
T
Tammy J
Google Icon
Rating 3 months ago
Highly recommend Noah for any plumbing work, he was punctured, professional, and explained the issue clearly. The blocking drain was fixed, and he cleaned up everything ... More
C
Caroline Cameron
Google Icon
Rating 3 months ago
I needed a blocked drain fixed in an older bungalow house with a mix of old clay pipes and new pvc ones. I contacted Service today and they did a great job. Andrew was at... More
S
Steve Hyland
Google Icon
Rating 3 months ago
Shortly after breakfast I discovered water in my kitchen sink wasn’t clearing. Subsequently, I then found several drains were overflowing, including the sump at the back ... More
H
Harrie
Google Icon
Rating 3 months ago
Had a badly blocked drain. Between Andrew, Matt and Kyle I was given options that would resolve the problem - I was never 'shoehorned' into any option. All of the work wa... More
L
Lyn & Darren
Google Icon
Rating 3 months ago
Blocked drain / broken pipe - From Ric who answered our call after hours to Greg who was here first thing in the morning identifying the problem and keeping us well infor... More
P
Paul Corcoran
Google Icon
Rating 3 months ago
Prompt, cheerful and helpful telephone response from Adriana before 8 am on a Monday, promising that technicians would attend before noon. They actually arrived before 9... More
I
Ivan J
Google Icon
Rating 3 months ago
Highly recommend service today. Noah did a great job supplying and installing a new Rinnai infinity gas hot water system.
J
Judy & Mo
Google Icon
Rating 3 months ago
We had them to fix our gas leakage problem and replace our gas Hot water system to electric Hot water system plus some other electrical maintenances and we found that al... More
Z
Zoe Palomy
Google Icon
Rating 3 months ago
Had a gas leak concern at our property and contacted Service Today straight away. The technician arrived promptly, carried out a thorough inspection, and quickly identifi... More
M
Michael Glanaly
Google Icon
Rating 3 months ago
Called Service Today because our gas hot water system wasn't performing properly. The technician was able to diagnose the issue quickly and had the necessary parts on han... More
C
Clarke Ann
Google Icon
Rating 3 months ago
Booked Service Today for a gas appliance safety check after purchasing an older home. The technician was extremely thorough and identified a couple of issues that needed ... More
I
Isabel Tahan
Google Icon
Rating 3 months ago
Our gas heater stopped working just as the weather started getting colder, so we called Service Today for help. The gas plumber arrived on time, quickly diagnosed the fau... More
S
Steven Maady
Google Icon
Rating 3 months ago
Very impressed with the service we received for a gas bayonet installation. The technician was professional, courteous, and took great care while working in our home. Th... More
A P
A P 7 reviews
Google Icon
Rating 2 days ago
Absolutely outstanding service. I had a broken toilet that was causing all sorts of chaos, and the plumber handled it with total professionalism and skill. They arrived o... More
Nicole Lehmann
Nicole Lehmann Local Guide • 12 reviews • 4 photos
Google Icon
Rating 2 days ago
Service Today are brilliant. I am a VIP member and the benefits are fanstastic. I just had a new air conditioner unit installed. From the booking process to the installat... More
M
Maria Caponas 4 reviews • 1 photo
Google Icon
Rating 2 days ago
This company certainly delivered. It began with my conversation with the staff in the office all the way through to completion of the job. They were punctual and efficien... More
L
Leanne Dormer 3 reviews • 1 photo
Google Icon
Rating 3 days ago
This buisness went above and beyond to make it work after the fan had components missing when purchased by me, returned to Retailer and replaced, The Electrician came bac... More
Pretty Witchie
Pretty Witchie 2 reviews • 2 photos
Google Icon
Rating 3 days ago
Great response to email enquire and booking. Zac turned up on time, was friendly, knowledgeable and extremely professional. Job done fast and efficiently. Absolute value ... More
Rakibul Hasan
Rakibul Hasan 7 reviews • 8 photos
Google Icon
Rating 3 days ago
I had a great experience with Service Today, especially the electrician Eli, who attended my property. He was extremely polite, professional, and easy to deal with.
M
Marylisa Visentin 2 reviews
Google Icon
Rating 4 days ago
I haven't had much success with plumbers in the past, but with this company, I have been very impressed. From the moment I rang to when the job was done, I am impressed. ... More
H
Helen Dyer 1 reviews • 1 photo
Google Icon
Rating 4 days ago
Jake and Matthew installed three ceiling fans in my house. They were very professional, polite and clean tradesmen. I would not hesitate recommending them to family and f... More
Maria Harris
Maria Harris 10 reviews
Google Icon
Rating 4 days ago
Had a service call from Service Today and Andrew, the plumber who came out, was fantastic. He was professional, friendly, and really took the time to explain the issue an... More
Liz San Juan
Liz San Juan 10 reviews • 1 photo
Google Icon
Rating 5 days ago
It was easy to make a booking for inspection. Chris arrived on time. He was honest with his findings. He explained the problem well enough for me and my husband to have o... More
P
Paula Abbott 4 reviews
Google Icon
Rating 5 days ago
Hi, I highly recommend this company. Marco the electrican came this morning and he was fantastic. Talked me through everything regarding my electrical issue and explained... More
As seen in the media
Woman with headset and "Service Today" logo on gray shirt smiling.

Need Help Today?

Electrical, plumbing and air conditioning services are essential, and our team is here when you need us. You can count on reliable service, expert workmanship, and same day service guaranteed.

Back to Top