cost of having a bath is 96p!!!!!!!!!!!!!!!!

crazyguy

The cheapest way to wash,

sisbod

thanks everyone I really appreciate a response to this! In the case of my DS and DIL I think I will work on aprox 75p a bath as they are horrendous for leaving the bath to run and forgetting about it to the point of it boiling hot and running out of the overflow! Then they empty it a bit to put cold in! AAAGH it drives me to distraction but as the pay a lot of the bill I shouldnt complain but it is a healthy lesson for them if they were to be on their own!
Fingers crossed when I show them this!

Joyful

I have a smart meter and found out a few weeks ago it cost me £22 for a well filled bath from a combi boiler.

globalds

I was going to get one of these

http://www.dealtastic.co.uk/nordic-eco-shower-head-galant-crome-9l.html?awc=2641_1315856508_dfc0a57a5080dcbba6c0dfdff6af4aff



But if it is only about 20p for a bath then it probably isn't worth it.

Gerrard_8_lfc

Joyful wrote: »

I have a smart meter and found out a few weeks ago it cost me £22 for a well filled bath from a combi boiler.

Do you bath in a swimming pool then ?.

davecampbell

I have done some tests and have found that using me gas CH, not a combi boiler, is not efficient in the summer when it is only on for hot water.
The boiler burns ~22Kw when it is firing and it takes about half an hour to get enough hot water for a bath - not a deep one.
That is, 12KWH, about 42p on my current tarriff.
I think that is because there is heat going to waste in the pipes, and there is a boiler full of hot water left over which doesn't get pumped round. As this method heats the whole tank, there is also left over warm water which might not be required.
The immersion heater will heat just the top of the tank, with no wasted energy, in 20min. That's 1KWH which costs 10p.

The down side is that I have to get up to turn the immersion heater on and go back to bed for 20min, and use the kettle for water for my one washing up session a day.

This is only applicable in the summer and propably only for 1 person, or maybe 2 people, in the house. When you step up the boiler use, the inefficiencies will become less relevant.

Dave

grahamc2003

davecampbell wrote: »

I have done some tests and have found that using me gas CH, not a combi boiler, is not efficient in the summer when it is only on for hot water.
The boiler burns ~22Kw when it is firing and it takes about half an hour to get enough hot water for a bath - not a deep one.
That is, 12KWH, about 42p on my current tarriff.
I think that is because there is heat going to waste in the pipes, and there is a boiler full of hot water left over which doesn't get pumped round.
Dave

Another reason for the high cost of ch gas boilers used just for hot water in the summer is that they are operating very inefficiently.

Obvioulsy, the boilers are designed to operate the ch in winter, and that means the temperature of the return water is quite low - much of the 22kw being used by the radiators. So the max efficiency will be with a return water temp of something like 25C I should imagine.

In the summer, the boiler still burns gas at 22kw, but the only place that is used is in the tank, and that certainly won't put anything like 22kw into the water, probably more like 3 or 4 kw, So the water returning to the boiler is relatively high temp, and the result of that is that the amount of heat extracted by the circulating water from the burning gas is less (although the amount of gas burnt is the same, i.e. 22kw when firing, although the firing will be less). I bet the boiler could easily be operating at 40/50% efficiency (compared to a max in winter of probably 90% these days, when the weather's right) and that, together with the other factors you mentioned, could easily make it more sense to use an immersion in the summer.

rogerblack

crazyguy wrote: »

The cheapest way to wash,

Or not.
I've had a couple of free baths this week - ~80l or so.
Solar-thermal water heater from ebay, fitted DIY, total cost all-in 400 quid.

Should pay back in under 6 years, and I now don't have to economise nearly so much on the hot water, which is a major plus psychologically - I've been making do with a flanel for a long time.

Oh - and to add to the above - the cost of the bath heated electrically would be about 80p.

grahamc2003

rogerblack wrote: »

Oh - and to add to the above - the cost of the bath heated electrically would be about 80p.

How do you arrive at 80p?

rogerblack

grahamc2003 wrote: »

How do you arrive at 80p?

Bath measures .5m*1.3m*.3m (not actually 1.3m, but that is the average).

This is 200l.
The incoming water supply is at about 15C.
I want it at 41C or so.
This is 26C hotter.

Energy needed is 26C * 200l *4180J/Kg/C, or 21.7MJ.
6037 watt-hours, or 6 kWh.
Times my average unit rate is 73p.
I'm not sure where I got 80 from, I may have assumed a slightly shallower bath. I just went and measured.