The average Slow Cooker runs at 95°C on Low [that's 203°F], which means some run slightly lower, some slightly higher.
Even the High setting Proctor Silex have stated, of between 200-225°F appears to be rather low, but it is still perfectly adequate. However there is no way that water will reach that temperature after only one hour.
You say that you are not going to slow cook for 12 hours to get satisfactory results, but I don't think that is necessary. 6-8 hours should be long enough for just about anything, but on the Low and not on the High setting, which should really not be used for any longer than 5 hours.
If possible you should have your slow cooker set on High for about an hour and then turn it down to Low for the remainder of the cooking time, which can be anything up to 12 or even more hours.
~~~Do as I say, not as I do~~~