There's a $49 water blaster, down from $100. Any opinions? Probably low quality, but if it works ten times it'd be worthwhile, compared with renting or even just driving to a friends place to borrow his.
Yep what he said. It will likely have plenty of pressure but water volume or lack there of means its like using a coloring in pencil on your driveway. Imagine how long it would take to colour in the whole drive! I have a Ryobi, and for small jobs its OK, but the whole house, takes forever!
Power is what you need to look at. Flow times pressure. Cheap units will use a small electric motor (amongst other things) so they have to use a small pump to get the high pressure but of course flow is low. Ideally you would want a unit with the maximum size electric motor a single phase plug at 10 amps can handle. So 2 kW+ would be ideal. From memory the one I bought had a 1.5 Kw motor in it. Works OK but flow is still an issue.
For comparison. Mine is a Nilfisk c125.3, which I believe does @1800 psi and 6-8 l/min. It will clean a path effectively if I keep the fan jet at a distance that cleans a strip @50mm wide and move at a moderate to slow pace. I have used a friends unit a few years back which was significantly less powerful and probably similar to the one in question. I had to have it cleaning a strip @10-15mm wide, move quite slowly, and often do multiple passes.
A friends is 1600 psi to that one's 1000psi, and has a similar flow rate, worked fine for decks, house, fences. A bit more power might be nice but I'd probably destroy more things with it. I think I'll give it a miss, I'll just keep borrowing the slightly better one.
Like I said the electric one I've used in the past which is a bit more powerful works fine. If I used a petrol one I might end up doing damage to the deck and such, though if I was careful and could do more at a time that'd be handy.