I upgraded this week one of our WFP pumps from an off the shelf 5.3 LPM to a 10 LPM provided by Vyair. Initially I had problems with it as the pressure switch seems to be faulty. So this morning I bypassed the pressure switch and worked with it on full-bore and BeJezus! it makes one hell of a difference to work.
Id say that Ive found a number of noticeable incidences that have affected my working life in a positive way. Initially changing from trad to WFP, then from trolley to van-mount then from van-mount to two man and on up to the current Grippa system we have. I would put upgrading to a 10LPM pump in the same bracket as those other changes.
It makes a cracking difference, windows really do take seconds to clean, literally. I would recommend it to anyone who has the capacity for the increased water required. Saying that, dont go thinking you use 600 litres an hour. The figures quoted by the manufacturers are at full pump potential, so with no resistance created by 100 metres of 6 or 8 mm hose and with no nozzles. In reality it was pushing out a fraction under 4.5 LPM at the brush-head, knocking about 60% off the quoted figures.
We also checked how much a 5.3 LPM pump was producing at the brush-head and this was 2 LPM.
So an improvement of twice the output at the brush-head, which is inline with the figures the manufacturers claim without resistance.
Vyair do a 10 LPM pump for just under £70.00, the same pretty much as a regular 5.3 LPM.