Category Archives: Hot Water Talk

Rheem Mains Pressure takes the OW! out of your shower!

Rheem Delta mains Pressure

The title of this blog is what you would have found attached to your Rheem hot water cylinder in the early 90’s! A marketing endeavor designed to encourage home owners to return a questionnaire which will enable them to take advantage of the amazing Rheem warranty.

Rheem_Delta

The back of this two color compact A4 flyer which folds into a convenient sized Free-post postcard states “Please return this questionnaire/warranty. It is your advantage for us to have it on file should the need arise to make a claim. As an additional incentive, your warranty will be entered into a monthly draw to WIN AN ELECTRIC JUG OR KETTLE, A TOASTER OR AN IRON.” I do love the “toaster” classic!

Some of these questions (eight in total, some of which are designed to “paint a demographic”) include:

  • Who selected your water heater? you or your plumber?
  • Where/why has this water heater been installed?
  • What did your new water heater replace?

1990_pipe_layout

Whats also interesting is the installation diagram Rheem has attached, stating that all other valves are optional and only required as specified by the local conditions and regulations. If you look at the schematic you will also notice it does not include a tempering valve. the shower priority is correct but some of the others questionable.

Good on you Rheem for taking such an interest in your clients! For over 25 years now Rheem have been the leaders in hot water heating and they continue to lead the industry by example.

HUNSON RT AKA “THE ELEPHANT”

Hunson_brandManufactured in Glen Innes Auckland on January 1978 by W. Hunt & Son Ltd this HUNSON RT revolutionized mains pressure water heating in New Zealand!

Due to high manufacturing costs and technology limitations, in the 1970’s hot water cylinders were primarily manufactured from copper.                                                         hunson_RT

Copper hot cylinders are made to suit low to medium pressures (75KPA – 120KPA), with medium pressure cylinders being made from thicker copper. The week spot on a cylinder is not the actual copper material but rather the machine manufactured welding seams. Anything above 120KPA depending on weld quality and the seam will crack resulting in a burst hot water cylinder!

So how do you get around this problem and achieve mains pressure using low pressure technology? W. Hunt & Son Ltd certainly acknowledged the demand for mains pressure and their reply was the advanced Hunson RT Direct mains pressure hot water system. Great engineering and ahead of its time.

What makes the Hunson RT so special?

hunson_diagram

 

The basic principal was to use the heat exchanger to supply mains pressure ONLY to one shower making it a semi “instantaneous water heater” (in the 70’s showers started becoming more popular) whilst using the large low pressure body of water to supply the exchange heat to the mains pressure coil and direct supply to all other low pressure fixtures such as a bath or laundry.

On request Hunson could manufacture these cylinders with multiple elements up to a total of 8KW! This would certainly make the supply more reliable and showers longer but expensive to run (not sure about power rates VS income in the 70’s). Modern cylinders use the same technology in reverse because water can now be stored in a mains pressure environment (stainless steel or enamel) and of course also because of a few other reasons such as efficiency and reliability.

What challenges did this “new style” mains pressure cylinder present to home owners?

hunson_rt_instructions

 

 

To start with, it was important the plumber got the installation right. If you have a look at the image you will see the instruction says: “At all times, the flow from the cylinder should be strong and steady, but not excessive”. Mains pressure can be anywhere from 120KPA to 500KPA and the term “not excessive” is too broad. If the pressure was set too high the heat exchanger would not have enough time to keep up with the demand. Plumbers also started using the mains pressure supply (which was originally only intended for one shower) to deliver mains pressure to the whole house and all plumbing fixtures! This immediately presented a problem because the standard supplied element of 3KW could not keep up with the demand and showering usually was over after 5 minutes! This was also the case with Hunson RT you see in this image. the only reason this cylinder survived over 30 years was because the hot water from the low pressure supply side was never used. The sludge build-up on the inside would reach all the way up to the element. Despite a sludge relief point which was most likely never ever used.

Another common issue this technology presented was random cold patches during a warm shower. Have a look at the diagram and see whether you can identify expansion, cold water inlet, hot water supply, overflow and sludge outlet. This date_230178cylinder also provides bottom entry connections for wetbacks.

Why did this hot water cylinder receive the nickname “The Elephant”? 

It turns out there used to be an engineering company in New Zealand call Elephant NZ. Elephant NZ originally came with this technology and design which was purchased by W. Hunt & Son Ltd. Why that actually engineering company was called Elephant, we don’t know but if you do, please send me an email so we can add this info to our article.

Its been a busy week for hot water cylinders!

many_hot_water_cylinders

2015 has just started and we are already in full gear!

All these leaky hot water cylinders can now only be disposed of as scrap metal. The mixture is never the same. Sometimes we have more mains pressure cylinders and sometimes only low pressure. A few months ago we even replaced 8 external gas Vulcan Freeloaders in 3 weeks! Its funny how the trend goes and very interesting to watch such anomalies.

Hot water cylinders LTD has many upcoming specials in 2015.  Some of these include:

  • Mains Pressure conversions
  • Instant gas hot water conversions. (gas water heating)
  • Stainless Steel upgrades.
  • Relocating internal hot water cylinders externally.
  • Complete services and maintenance programs.

To get your obligation free quote on replacing or repairing your hot water cylinder, please call us on 0800 429 546 or email quotes@hotwatercylinders.nz

No Hot Water on New Years :(

no_hot_water_testingThe last thing you need when you come back from holiday is to find your hot water cylinder has stopped working especially when you urgently just want to take a shower! Many people tend to turn their hot water cylinders off during this time. This in itself is not a problem unless your hot water cylinder is 10+ years old. Turning off the power to your hot water cylinder will of course allow the body of water inside the tank to COOL OFF, this is something your hot water cylinder is not used too as water is constantly maintained at 60 degrees. This “cooling off” will result in extreme contraction of the tank itself which initially does not cause the leak. Most Aucklander’s will coming back from holiday and the first thing they do is switch on the power to the hot water cylinder which will immediately power-up a 3KW element which in return will heat up the body of water back to 60 degrees in a relatively short mount of time. This will now cause the tank to expand very quickly. Depending on age this is when your hot water cylinder might spring a leak! Unfortunately we cannot give you advice whether to keep the power on or off during your absence but encourage you get your hot water cylinder serviced prior to going on holiday to ensure you don’t come back to any nasty surprises. In the image above the home owner was very fortunate that only the immersion heating element was damaged. Replacement of the element was under $200 and included a full check of the thermostat and hot water heating system.

Its time to service your water heater

New Zealand weather is changing and temperatures are dropping. So it’s time to think about getting your water heater or central heating boiling system serviced.

Servicing a Rinnai

Servicing a Rinnai

Why should I get my water heater serviced?

  • To ensure its operating safely > Regardless of system type you want to make sure that its safe! With gas water heaters our service consists of a comprehensive checklist some of which are the following: checking a gas leaks, ensuring the fan is operating correctly, making sure flue gasses (CO and carbon monoxide > combustion check) are in the correct range and not a threat to your family. We also check the appliance physically to ensure the flue is not blocked or leaking, remove cobwebs and give is proper clean from the affects of its natural surroundings. Electrical appliances are also checked for safety, ensuring all safety valves are operating within an acceptable range protecting your family from burst tanks, and scolding temperatures.
  • To ensure its operating efficiently >> Another main component servicing your water heater and central heating boiler is make sure its working efficiently. Is it burning more gas than required? Is your power / gas bill to high? The way your appliance processes Energy is very important if left to run in-efficiently your tear and wear factor will increase making future repairs expensive and reducing the appliances life span!

I have only listed a few things that apply when we service your appliance. Our comprehensive check list will ensure that you can enjoy the upcoming winter days not having to worry about high power / gas bills knowing your appliance is running safe.

Here a range of appliances we can service:

  • Electric Hot water cylinders
  • Gas hot water cylinder
  • Gas central heating boilers
  • Commercial combi-central and domestic heating systems.

Hot water cylinder NZ specialise in how water heating appliance servicing. Whether gas or electrical, residential or commercial. Book yourself in and make sure you ready for winter!

 

Welcome to our brand new website!

Welcome to hot water cylinders New Zealand! A company with passion for hot water heating! After a long 6 month production today our website has finally gone online. We are very proud to introduce the “GO TO” website when it comes to hot water heating applications and solutions. Hot water cylinders is who we are and what we do every day. We know all brands, the ins and outs, benefits and disadvantages. Questions? give us a call or send us an email. Our service and pricing is hard to beat. Thinking about renting a new hot water cylinder? Finance? Call us and find out what the best solution is for you circumstances.

On our blog we will be introducing new work, testimonials, technical information about all in New Zealand available hot water cylinder systems and much more.

Keep a look out for those specials! Save cash weekly with www.hotwatercylinder.co.nz! We look forward to hearing from you soon!