Where the hose joins the spray-thing, there should be a washer. Replace with a washer with a smaller hole in it. A lot of spray-things come with a selection of washers for different water flow rates.
If you've got adjustable patters on the spray-thing, one of them might use less water than the others.
Or just superglue over some of the holes.
Owain
Megalflo? Bad move. Should have fitted a heat bank.
See. Problems already.
Ah... Given the low cold water temperature and not brilliant recovery of the cylinder, it all adds up.
You should be able to get a flow restrictor for the shower head from the manufacturer. They are usually a disk or similar which goes between the head piece and hose or head piece and pipe where it comes from the wall.
At this rate, if you can reduce the flow rate to (say) between 20 and
25 lpm it will still be a very respectable shower and almost double the run time.The other thing that is worth checking (as mentioned) is the gas rate. Remember 4 cu.m/hr for 37kW. You can pro-rate that for lower usage rates. If the rate is less than that required for about 20-25kW, then it is worth investigating the plumbing between boiler and cylinder, pump etc. Otherwise, you are basically limited by the rate that the cylinder can absorb the heat energy. At least it will tell you whether further professional investigation is warranted.
Andy
Thanks. I have emailed Aqualisa and asked them for a flow restrictor. I hope they will be able to provide me with one. On the benchmark, it did mention the gas flow rate at 4cu.m/hr (for the HW). I have not done my own test to confirm this, but that is what the installer has put in the benchmark booklet. When I get a chance, I will try to test this out myself.
Regards Bernard
If you a 300L megaflow then the amount of HW should be pretty substantial. Obviously you might be showering with something akin to a fire hose.
So you need to look at the heating side of the cylinder. Obviously some heat is going in. What is the boiler flow temperature set to? What is the cylinder thermostat set to. Is the thermostat cutting the boiler out.
20 to 24 litres/min is a gushing shower.
They should be able to do so. If not, a little hunting wioth other manufacturers should turn one up - the fittings are usually a standard size.
He may have just copied it from the installation manual or perhaps measured it with the heating.....
To make it a reasonable test, you need to make sure the CH is off and the cylinder cold. Then fire up the boiler and read the meter at 10 min intervals. If it reads in cubit feet you will need to convert, but otherwise you can divide each interval by 10 to get the rate per minute averaged over the interval. I would expect the rate to be higher to begin with then it may reduce as the cylinder temperature rises and the return water temperature from the cylinder coil does as well. At that point, the cylinder coil is not transfering as much heat into the water and the boiler may throttle back.
Based on what you've said, you'll end up with 9 or 10 readings or thereabouts as the cylinder is reheated and that will tell you exactly what's happening in terms of heat going in.
Try not turning it on so hard...
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