"Andy Hall" wrote in message
...
On Fri, 02 Jan 2004 14:55:00 GMT, Mark Trotman
wrote:



Christian McArdle wrote:

So, you need to answer the following questions:

1. How many baths and showers do you have?

1 bath, 3 showers

If these are run concurrently you would have a high demand on the
system.




2. How many people live in the house?

5

This suggests concurrent use or will do as time goes on.



3. Does anyone prefer baths to showers?

Yes, I prefer a bath, the wife, a shower. The kids prefer neither ;-)

They will when they are teenagers.




4. What is the maximum flow rate at your kitchen sink? (use a bucket
and
stopwatch to measure).

150 galls/hr

I make this about 11.4 litres/minute. (there being 4.55 litres to an
imperial gallon).

You really need at least twice that for any mains driven system or the
results are going to be disappointing. You may need to consider
getting the service pipe upgraded from the road.

Check all the stopcocks/isolators in the line are fully opened up. I
measured
a disappointing 12 l/min in my kitchen after installing a new combi in a new
location, but this increased to 19 l/min after I opened up the brass
isolating
tap that fed that spur by a few more turns. It had been opened only by a
couple
of turns during my initial tests.

Andy.