We have just had our low flow Methven shower heads which we bought through the ATA shop for a full water billing cycle. So I'd thought it might be useful to report our experience.
My partner takes long showers [about 15-20 mins] due to a disability and we can't really reduce the time much further, without creating stress.
We already had 5 litre per min low flow shower heads to which I had added 4 litres per minute restricters. The shower was experience a barely adequate, narrow spay but I was willing to accept it for a lower gas bill. Partner was not really happy, but put up with it. Our total water usage was about 350 litres per day for two people.
Our water usage is minimal in other parts of the house and garden, we have a front load washer, never water our garden.
We installed the Methvens as standard, without any extra restrictors. Our water and gas bill is exactly the same as with our previous low flow set up. However the shower experience is much better. The spray is wider. It is kind of like a rain fall. The pressure of the shower on the skin is quite satisfactory too. Partner is happier too.
So we found that we get a more satisfying shower for the same low flow with the methvens. It must take some clever engineering to achieve that. Some thing to do with droplet size?
My original goal was to reduce our water usage further. The water flow spec. for the methvens and our previous setup was fairly similar. So our result is not surprising.
The shower experience is better though. It's way ahead of all the low flow heads I have tried over the years. But they are not cheap either.
So I'm now looking for other ways to reduce our hot water cost.
I have tried all the simple/cheap solutions I can find, valve cosy, extra pipe insulation, lowest safe water temp etc. Extra tank insulation proved a bit impractical with gas storage hot water. So the next thing will probably be heat pump hot water.
Posted Wednesday 12 Apr 2017 @ 12:18:29 am from IP #