How long does the hot water need to be on for? - HotUKDeals
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How long does the hot water need to be on for?

ghinzani Avatar
8y, 2m agoPosted 8 years, 2 months ago
Just wondering as we have a gas boiler, what a plumber described as a "fairly decent" hot water tank and theres myself, the wife and a toddler. So two showers and a baby bath and washes with nappy changes. Washing machines off a cold water feed, as is the dishwasher. Presently our boilers on for over an hour in the morning, however I think thats too long - especially as we have got a solar panel on the roof (much good thats going to do here...).

Any tips or pointers??
ghinzani Avatar
8y, 2m agoPosted 8 years, 2 months ago
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#1
Does it not heat it in the pipes i.e. you can just switch it on when you want to use it and use the solar panels to heat the tank as a back up
#2
Ours is on permanently.. The tank is lagged with polystyrene so not much heat loss..

Hot water whenever you want.. not a luxury, but essential in my eyes..

IT could be a false economy to only have the heat on for an hour or less. If the water cools then you end up heating the whole tank every day.

Would be interested in the real facts though..
#3
Unfortunately without a combi boiler it has to heat the whole tank up gradually. If you shorten the time the water may not get up to the right temp. That is why they are deemed as more expensive to run.

Try shortening the time each day until you run short of hot water.

Does anyone know how much an average boiler costs to run per hour?
#4
Don't know anything about solar panels but a boiler if its timed for an hour will not run for an hour all its doing is just topping up the heat in the cylinder, however if you've had a heavy run in the bathroom it will be on quite a while afterwards and to heat it up from cold to 60 degrees will take around 1 hour to 1.5 hours depending on a few issues like temperature of cold feed (i.e if it's colder then normal it will take longer) boiler output and size of cylinder.
#5
it should take about 30 to 45 mins to completely heat the tank from cold according to the British Gas engineer I had out the other day (mines an old boiler so probably 30 mins)
#6
rockyfella;2999430
Ours is on permanently.. The tank is lagged with polystyrene so not much heat loss..

Hot water whenever you want.. not a luxury, but essential in my eyes..

IT could be a false economy to only have the heat on for an hour or less. If the water cools then you end up heating the whole tank every day.

Would be interested in the real facts though..

Have been told the same thing by lots of different people. Best to leave it on and just keep topping up rather than heating the whole tank each time.
#7
So leave it on permenant? Then what does the solar panel do?
#8
do you mean leave the immersion on or the gas?
#9
ghinzani
So leave it on permenant? Then what does the solar panel do?


that'll be cooling your water down looking at our summers
banned 1 Like #10
an hour is excessive and heating it up continually when the supply is drawn as others have suggested is most certainly a far more expensive way to do it.

Boilers work most efficiently on full power, so it's more efficient for things to cool down more and then get heated up more.

And the loss of heat is less if the temperature of the tank is lower.

Mine goes on for 20 mins each morning and that is enough for 2 power showers (15 and 5 minutes each) and hot water for the rest of the day (about 2-3 sink loads).

Hot water stays at the top of your tank so no need to keep the cold at the bottom hot as well all day, when it wont be used until the next day (by which time it would have lost a fair amount of heat via the tank).

Anyway, the most important factor is your thermostat setting on the tank itself. People generally have this on far too hot and then mix in cold when drawn off :w00t: A very poor use of HW.

Set your thermostat on the tank to 60 degrees to start with and adjust either way depending on preference.

An hour still seems excessive. Are you sure this isnt just the timer setting being set for 1 hour rather than the boiler actually heating the water for the full hour?

What is your boiler temperature setting on? Most can be set very high thus your water would reach the correct temperature quicker. Some dials are in reach of small fingers so the dial gets set to a low setting meaning boiler will keep switching on and off a lot more and HW temp will take longer to achieve.

http://www.plumbingpages.com/featurepages/Tipsrunningcost.cfm
#11
Hi, thanks for that in depth answer - my tank is already set to 60 degrees, and the boiler itself is set to 3.5 with 4 as the max, I believe. I am going to set the timer for 25 minutes, it comes on around 5am for quite a while at present so lets see if 25 mins only helps. Thanks again for the advice.
#12
Actually just checking its set to 3.5 out of a max of 6, so I will set it up to 5.5/6 maybe?
#13
Just to say 20 mins at full power proved more than adequate yesterday, thanks for the advice!

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