Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


Filter this topic showing only the reply marked as answer View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 | 3
593 posts

Ultimate Geek
+1 received by user: 362


  Reply # 1859312 5-Sep-2017 23:36
Send private message quote this post

It doesn't seem particularly high to me. 45kg used in 6 weeks is 14kWh/day or 5400kWh/year. To go through the same amount of gas in 4 weeks is 21kWh/day or 8000kWh/year.

 

Edit: Actually, considering you're only using it for hot water, 14kWh gives you 230L/day of 55°C water (assuming incoming water temperature of 12°C and 80% energy efficiency). That does seem a lot.





"War is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth war is much worse. The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself."
- John Stuart Mill


2 posts

Wannabe Geek


  Reply # 1859362 6-Sep-2017 08:29
Send private message quote this post

That does seem very high... 

 

Similar setup, normally 2 people, we use gas for stove top as well as continuous flow hot water without a temp control, (2x 45KG bottles)

 

We've been in our house since November last year.

 

- 2 new bottles end of November

 

- Bottle ordered 18 April

 

- Bottle ordered 10 July

 

We had a house full over Christmas (4 adults, 2 Kids) , and then again over April/May (4 adults, 3-4 kids depending who was visiting).

 

I'd be getting someone in to check for leaks.

 

D


 
 
 
 




1754 posts

Uber Geek
+1 received by user: 494


  Reply # 1859582 6-Sep-2017 12:10
Send private message quote this post

Oblivian: And unless you are with a junk provider, the bottles are serialised weighed. They should credit the fill difference.

 

With Contact Rockgas, so I will query about this. I don't recall ever seeing any refunds.




1754 posts

Uber Geek
+1 received by user: 494


  Reply # 1859584 6-Sep-2017 12:12
Send private message quote this post

deonb:

 

I'd be getting someone in to check for leaks.

 

 

You mean water or gas leak?

 

We can't smell anything, but I might contact the installer.


2953 posts

Uber Geek
+1 received by user: 1064


  Reply # 1859596 6-Sep-2017 12:19
Send private message quote this post

Looks like a text book seasonal temperature effect to me.





Mike



1754 posts

Uber Geek
+1 received by user: 494


  Reply # 1859604 6-Sep-2017 12:24
Send private message quote this post

MikeAqua:

 

Looks like a text book seasonal temperature effect to me.

 

 

I suspect you're right, but the usage still seems very high for just the 2 of us.

 

I arranged for the installer to come out and check it. Worth the cost for peace of mind, and if they find something wrong then I would assume they would need to fix it at their cost as the install is less than a year old.


855 posts

Ultimate Geek
+1 received by user: 255

Trusted

  Reply # 1859651 6-Sep-2017 12:58
Send private message quote this post

I did the maths. If you use less than 5 bottles per year, then you are better off on bottles. 

 

More than 5-6 is roughly the same as piped gas.

 

More than 6 45KG bottle changes per year. Its cheaper to get gas piped.

 

Sounds like you having long showers. Are you sure your dishwasher/washing machine is not drawing a lot of hot water too?

 

 

 

Have you checked for leaks? 






2 posts

Wannabe Geek


  Reply # 1859666 6-Sep-2017 13:16
Send private message quote this post

Paul1977:

 

You mean water or gas leak?

 

We can't smell anything, but I might contact the installer.

 

 

 

 

Gas leak, might not smell anything if an outside section? not sure how your pipes run...

 

 


386 posts

Ultimate Geek
+1 received by user: 69


  Reply # 1859684 6-Sep-2017 13:31
One person supports this post
Send private message quote this post

Paul1977:

 

We don't have temperature controls in kitchen or bathroom, it is set at the unit to 55 degrees and we just mix in cold to get the desired temperature.

 

 

Not sure,but would it be worth getting a temperature controller fitted?

 

I use 55 degrees for washing dishes and some laundry.  Showers I set to 42 and leave the mixer maxed.  Was pointed out to me when I used the same default of 55 for everything that heating the water past where you need it then adding cold to bring it back down was wasting gas.  Someone better than me at the physics can probably calculate the cost difference and the payback for getting a controller fitted.  :-)





45 posts

Geek
+1 received by user: 5


  Reply # 1859696 6-Sep-2017 13:39
Send private message quote this post

My refills for a household of two adults, with gas for hot water and cooking.

 

 

 

Refils:
20/07/2017
08/06/2017
02/03/2017
06/01/2016
10/10/2016
27/06/2016
30/03/2016

 

 

 

Water configured to 42-43 degrees for majority of time. Potentially slightly hotter in the winter.

 

Sometimes water set to 50 for dish washing.

 

Cold washes for washing machine.


2019 posts

Uber Geek
+1 received by user: 168


  Reply # 1859697 6-Sep-2017 13:40
Send private message quote this post

Paul1977:

 

Oblivian: And unless you are with a junk provider, the bottles are serialised weighed. They should credit the fill difference.

 

With Contact Rockgas, so I will query about this. I don't recall ever seeing any refunds.

 

 

Don't quote me on it. But you see them zapping away on/off so there has to be some sort of end to end checks going on. Potentially see a lower fee vs credits *shrug* may also work on a 'make sure its empty cause we charge same regardless' scheme

 

 

 

 




1754 posts

Uber Geek
+1 received by user: 494


  Reply # 1859705 6-Sep-2017 13:56
Send private message quote this post

deonb: 

 

Gas leak, might not smell anything if an outside section? not sure how your pipes run... 

 

 

All the gas pipes for the water are outside, but one running to kitchen (which isn't used) goes under the house.

 

They are coming out on Friday to check for leaks, and I think It'll get them to install a shutoff valve to the pipe going to the kitchen while they are there - regardless of anything else it makes sense to me to be able to shut off gas to the kitchen separately.


1792 posts

Uber Geek
+1 received by user: 211

Trusted

  Reply # 1859952 6-Sep-2017 20:42
Send private message quote this post

geoffwnz:

 

Paul1977:

 

We don't have temperature controls in kitchen or bathroom, it is set at the unit to 55 degrees and we just mix in cold to get the desired temperature.

 

 

Not sure,but would it be worth getting a temperature controller fitted?

 

I use 55 degrees for washing dishes and some laundry.  Showers I set to 42 and leave the mixer maxed.  Was pointed out to me when I used the same default of 55 for everything that heating the water past where you need it then adding cold to bring it back down was wasting gas.  Someone better than me at the physics can probably calculate the cost difference and the payback for getting a controller fitted.  :-)

 

 

I'm not sure that you are wasting gas. If you are mixing 55deg water down to 42deg by adding cold water, then you are using less volume of hot water. If you are using straight 42deg water, then you are using a greater volume of hot water. There might be some efficiency issues (what temp does the gas system burn most efficiently at?) but in general it comes back to the laws of physics - you can't destroy energy.


20190 posts

Uber Geek
+1 received by user: 3783

Trusted
Subscriber

  Reply # 1859984 6-Sep-2017 22:00
Send private message quote this post

more would be lost in the pipe from heater to shower at a higher difference from ambiant. Not sure what the flow would be there too, that would have an effect on the efficiancy of the heater along with the amount of rise it is adding. In winter I would expect twice the consumption since about twice the temperature rise needed for the incoming cold to what comes out the shower head, regardless of where it is mixed etc.





Richard rich.ms

1835 posts

Uber Geek
+1 received by user: 575

Subscriber

  Reply # 1860529 7-Sep-2017 19:40
Send private message quote this post

It will be slightly more efficient to use a controller, and have the heater outlet temp set to exactly what you need in the shower. Partly due to pipe losses, and partly due to the heat exchanger inside the water heater running colder, meaning more of the heat from the burners gets transferred to the water. I can't calculate if you would save enough money to pay for the cost of installing a controller though.

 

Also a properly installed twin bottle LPG setup shouldn't have any efficiency loss when 1 of the bottles gets low. As a properly functioning changeover regulator will draw gas from the reserve bottle to topup the flow from the main bottle, if the main bottle can't provide enough gas.

 

And for those comparing gas usage - check your shower flow rates. If person A has a 9L/min shower, and person B an 18L/min shower. No surprises that the person with the 18L per min shower will use alot more gas.

 

Also @Paul1977 get your gasfitter to recommission your water heater while they are onsite. This means checking the gas inlet pressure at max flow. And checking the burner pressures at forced min combustion and forced max combustion. Even though the installation instructions for most units don't say you need to do this for a new install. I always do it whenever I install a continuous flow heater. And If I get asked to service or repair one. As if the pressures get too far out of adjustment, you can get unstable outlet temperatures. And in extreme cases, the flue gasses smell of raw gas. (I have has callouts for gas leaks due to someone smelling gas, where the only thing wrong was a water heater that needed adjustment).






1 | 2 | 3
Filter this topic showing only the reply marked as answer View this topic in a long page with up to 500 replies per page Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Chow brothers plan to invest NZ$100 million in technology
Posted 24-Sep-2017 16:24


Symantec protects data everywhere with Information Centric Security
Posted 21-Sep-2017 15:33


FUJIFILM introduces X-E3 mirrorless camera with wireless connectivity
Posted 18-Sep-2017 13:53


Vodafone announces new plans with bigger data bundles
Posted 15-Sep-2017 10:51


Skinny launches phone with support for te reo Maori
Posted 14-Sep-2017 08:39


If Vodafone dropping mail worries you, you’re doing online wrong
Posted 11-Sep-2017 13:54


Vodafone New Zealand deploy live 400 gigabit system
Posted 11-Sep-2017 11:07


OPPO camera phones now available at PB Tech
Posted 11-Sep-2017 09:56


Norton Wi-Fi Privacy — Easy, flawed VPN
Posted 11-Sep-2017 09:48


Lenovo reveals new ThinkPad A Series
Posted 8-Sep-2017 14:37


Huawei passes Apple for the first time to capture the second spot globally
Posted 8-Sep-2017 10:45


Vodafone initiative enhances te reo Maori pronunciation on Google Maps
Posted 8-Sep-2017 10:40


Voyager Internet expand local internet phone services company with Conversant acquisition
Posted 6-Sep-2017 18:27


NOW Expands in to Tauranga
Posted 5-Sep-2017 18:16


Windows 10 Fall Creators Update coming Oct. 17
Posted 4-Sep-2017 14:10



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.