Is it true that new bath installations must have a thermostatic mixer that limit HW temp to 40C?
Dunno if it makes a difference to the regulations but I'm in Scotland.
Tim
Is it true that new bath installations must have a thermostatic mixer that limit HW temp to 40C?
Dunno if it makes a difference to the regulations but I'm in Scotland.
Tim
On Thu, 18 Dec 2008 14:23:19 -0000 someone who may be "Tim Downie" wrote this:-
"Section 4 - Safety (pdf, 2.2Mb)"
"4.9.5 Hot water discharge from sanitary fittings" [snip]
"If water is supplied at high temperature, from any source, there is a danger of scalding to building users. Risk of severe injury increases proportionally with increase in temperature and with extent of contact.
"To prevent scalding, the temperature of hot water, at point of delivery to a bath or bidet, should not exceed 48º C
"A device or system limiting water temperature should not compromise the principal means of providing protection from the risk of Legionella. It should allow flexibility in setting of a delivery temperature, up to a maximum of 48º C, in a form that is not easily altered by building users. This will allow reduction of temperature where, for example, facilities are used by those more at risk from injury, such as elderly people or unsupervised children.
"Where both hot and cold water are supplied to a facility, the above may be achieved by use of a thermostatic mixing valve (TMV) or fitting complying with BS EN 1111: 1999 or BS EN 1287: 1999, fitted as close to the point of delivery as practicable. Guidance on the installation, use and maintenance of thermostatic mixing valves and fittings can be found in BRE information Paper IP 14/03 and from the Thermostatic Mixing Valve Association (TMVA).
"Where a dwelling is altered or extended, but not converted, and new sanitary facilities are provided, some primary heat sources, such as older combination boilers, may not be suited to temperature control in the manner given above. In such cases, advice should be sought from equipment manufacturers on compatible means of limiting hot water temperature to controlled facilities."
Building Standards in Scotland are different to the Building Regulations down south. The differences are not dramatic, but they are there.
Apparently not.
Just found that one myself. Should have googled a bit harder first. ;-)
48C is livable with. 40C is just too low for bath filling.Cheers.
Tim
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Thanks again. Found this myself after a bit more googling. Just not used to searching this kind of stuff. Seems there was some misinformation floating round between my builder & plumber.
Tim
On Thu, 18 Dec 2008 14:53:33 -0000 someone who may be "Tim Downie" wrote this:-
The Building Standards web site appears designed for people not to find information. One of these things where when you know the answer it is easy to find the answer.
Check if the rules quoted apply to private dwellings.
I was under the impression that the limit south of the border was 43C but only in places with "at risk" persons, like the elderly.
SHOULD not exceed 48 deg C ?
I only see it saying that this is Guidance To Water Bye-Laws "To prevent scalding, the temperature of hot water, at point of delivery to a bath or bidet, should not exceed 48º C"
So what's the legal situation ...presumably builders are expected to adhere to this in new builds ?
I second that.. toolstation do a reasonable mixer.. I fitted one a couple of months ago to reduce the temp on a combi for an 87 yo.
Obviously insisted upon by combi makers so they can claim they fill a bath in the same time as a storage system.
But as the plumber at work today pointed out, "it takes 25 minutes for a
300L cylinder to recover using a pumped system, you could use that time better with a combi".I am not to sure what time I am saving.
Mind you if I was fitting a combi and removing a Y plan as this plumber was I would have checked the mains water flow to the house before installing the combi.
His customer now has 3 litres per minute of warm water and is not happy.
Adam
Easy.. it reheats the tank while you are in the bath. With a combi you don't get to have the bath until it has spent 15 minutes filling it. Unless you like to sit there in a few inches of water with the taps running a combi is not very good for baths.
Why hasn't he got 3l of hat water? If the pressure was higher he would have 6l of cold water would he not?
Why didn't you just turn the HW temp down inside the boiler? - there's a screw on the PCB - one for CH too.
More like an hour to heat up. Depends on size of boiler, it needs a decent sized boiler to reheat 300 litres in 30 minutes. Yep a 15 litre/min combi gives 450 litres in 30 minutes. A cylidner can't touch it. A 23 litre/min combi, the Ethos, will deliver, 690 litres in 30 minutes. There again a storage system can't come close.
That is why MacDonalds always specify banks of Rinnai multi-points, where they can fit them.
Total tripe. A 15 litre/min combi will fill a average bath in 7 minutes. And you can be in the bath when it is 1/3 full and filling while you are in it.
Total drivel. You have been continually told that high flow combis are around - 2 bathroom jobs. Are you really that thick?
With a coil it only provides low grade heat, heated from the bottom (that is low temperature to you). It only brings in the boiler when around 40% of the cylinder has cooled and the boiler will not supply all the heat in winter as the CH takes some of it. And heat produced will be low graded heat.
You should be concentrating on serving the customers rather than looking round.
But if it has to recover after filling a bath a decent one will while you're having that bath. At least you don't have to wait ages for it to fill.
You make sure it's heated the water before you need it.
So dribble's had a customer?
Please eff off as you are an idiotic plantpot.
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