What is your hot water temperature?

No cylinder, IIRC our taps are set at 46. The taps still pump out scalding water at times though, although set it any lower and the water then doesn't seem to get warm enough.
 
Hot is hot, cold is cold. Combi boiler is old so no setting i know of for water temps. Hate to say it but if you're going to get legionnaires it won't be from home no matter what temps your water are, it'll be from hospital if you've a severe issue or stay in a hotel. Worked in the industry, and just like the others it's absolute joke.
 
Yaayuh! said:
I don't have a cylinder, but i have the combi set to 55c for HW.
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what he said well it says 57C

irrespective of legionella , or increased tank losses, temperature needs to be higher because you are mixing the water with cold at the taps to deliver high enough flow rate (combined through pipes) for upstairs showers;

since it is mixed, have to typically increase it winter time, as cold water is colder.
 
I set the boiler to 48c for hot water, as any lower makes getting grease off dishes a chore and any hotter is uncomfortable to hold your hands under, especially in summer when the cold water feed into the boiler is slightly warmer.
 
No idea. I measure mine by sticking my toe in it. I would imagine it's about 60 ish, which is screaming but not hospitalisation temperatures.

Mine is set by the traditional thermostat on a tank, which doesn't really set the temperature, rather sets the quantity of hot water. The temperature of the central heating is just short of seventy degrees, and of course that influences the temperature of the hot water. Although the tank is set to 53, I would say the top temperature is about 60 degrees. It varies a bit, of course, depending on how hot the cylinder was before the heating cycle started.
 
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54C on our water storage with a legionella cycle every 5 days which holds the water at 62C for an hour.

Could probably drop it to 52C on reflection (2 adults, 2 children).....I do like a very hot bath from time to time though and it's useful having that tank heat for when everyone else has had their turn.
 
Joe Jones said:
54C on our water storage with a legionella cycle every 5 days which holds the water at 62C for an hour.

Could probably drop it to 52C on reflection (2 adults, 2 children).....I do like a very hot bath from time to time though and it's useful having that tank heat for when everyone else has had their turn.
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How do you do a legionella cycle?
 
Joe Jones said:
The Thermostat on the tank has a basic scheduling system in it.
Mains hot water is 62C and the thermostat will warm the tank to 54C on a normal day.
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Ah so you just let it run for longer a day each week, so its got more chance to hit the higher temp?
 
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The cylinder of our heatpump system is set at 50C but it also has a weekly pre-programmed legonella cycle.
 
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Is there a simple way to understand how to correctly configure my tank/boiler?

I have a brand new Kingspan cylinder and brand new Vaillant boiler. Some how I am using between 7 and 10 kwh of gas?
 
Sounds about right.

We're on about 10kWh of gas a day and that's 1 bath about half full for the children and 1-2 showers a day plus usual hand and dish washing and maybe 1 or 2 hot baths for myself a month (which drains half the tank as I like it really full too. :D)

My hot water is timed to heat twice a day, from about 6:30 to 7 to just warm up from losses overnight, then from 17:30 until 20:30 to warm up ready for baths and showers in the evening.
I wouldn't leave it timed for all day as you're tank will cycle on and off, probably not that often, throughout the day as natural losses occur.

I also made sure to insulate the run of pipe from the top of the tank where the hot water flows from. The shutoff valve was constantly at 54C! just venting into the cupboard.
 
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yes 10kwh sounds ok ... if, single occupancy, you mix the bath up to your nose, used to do that in university halls,

jpaul said:
you can bound the time it should take for the boiler to heat the water in the tank (or part of the stratified tank)
so if your 30kw boilers been on for 20minutes thats 10kwh of energy and would have heated about 200L from 20->60C
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