I have an old boiler - the one you turn on and heats up all the water before you use it - the one with a tank. I'm looking for an upgrade that doesn't use a tank. I'm concerned that it would have to be a good efficint boiler that can work really hard and kick out lots of hot water.
2007-07-26 21:29:17 · 6 answers · asked by Anonymous in Home & Garden ➔ Maintenance & Repairs
You don't use a combination boiler with a power shower! Use a thermostatic mixer valve (combi compatible) and there are a lot of combi's that will deliver 15 litres plus, I use Worcester Bosch boilers, the 37cdi gives 15.1 litres per minute, if you insist on the power shower you will need a cylinder with the capability to deliver the amount of water you need, this should be calculated taking into account the cold water supply from a storage tank, this will equalise the pressure between hot and cold water. The other thing to remember, is that with the new energy efficiency regulations, you cannot install a conventional (with tanks) boiler which exceeds your heat requirements!
2007-07-30 08:59:03 · answer #1 · answered by Anonymous · 0⤊ 0⤋
We do not have enough data.
You want to deliver 15 liters / minute. You did not indicate the incoming water temperature and the desired exit temperature which is needed.
Let's say the incoming water is at 15 C and the desired exit temp is 30 C. or a temp rise of 15 C
This means you wish the heater to deliver 15 deg x 15 liters / minute or 225 Kcal / minute assuming a 100 % heat transfer efficiency. No heater will deliver at 100 % efficiency, so let's assume a 90% efficiency; this means that the heater has to deliver (15 deg x 15 liter / min).0.90 = 250 Kcal / minute.
Now go back and ask yourself what the likely water input temp is, what the desired exit temp will be, and what efficiency the unit will deliver. From this you will determine the Kcal / minute demand. You can convert the Kcal / min into watts if you wish - just do the simple math conversion.
2007-07-27 02:30:11 · answer #2 · answered by GTB 7 · 0⤊ 0⤋
A combi boiler sounds like the best bet and because it only heats what you use is also efficient and energy saving. Best bet would be to talk to your local plumber's merchants - they can recommend the right size for you - the key is getting one with a large enough pressure vessel - but the number of people in your house, number of bathrooms, etc all needs to be taken into consideration along with the high demand from your shower. We have a Trianco Eurostar which is supposed to be one of the most efficient oil fired combi boilers available, but you don't say if you are on oil, mains gas or LPG.
I am also lead to believe that there is some very useful info on this on the British Gas website.
2007-07-27 02:10:08 · answer #3 · answered by Steel Lady 2 · 0⤊ 1⤋
There is no boiler will heat that much water per minute. What you have to understand is that the water circulating through the boiler must have time to heat up before you use it. At the rate you want the water will pass through the boiler so fast that it wont have time to heat up. I would suggest you try an electric shower about 9 kilowatt, without a pump.
2007-07-28 09:52:06 · answer #4 · answered by Anonymous · 0⤊ 1⤋
Not trying to be nasty or anything , but don't you think that 15L of hot water a minute are a bit excessive? Surely you don't need that much for just a shower.
2007-07-26 21:40:45 · answer #5 · answered by Josie E 2 · 0⤊ 0⤋
Check out www.npda.co.uk.
Its the national property developers association so I'm sure someone there will be able to advise you.
You can become a member (for free) and ask in the forum.
Hope this helps!
2007-07-30 05:09:44 · answer #6 · answered by Anonymous · 1⤊ 0⤋