On Fri, 09 Sep 2005 15:58:23 +0100, John Rumm
wrote:

| Dave Fawthrop wrote:
|
| I took into account my atypical requirements and note the abundance of high
| output combi boilers available for those with larger properties and less
| insulation. The SEDBUK list gives 7 boilers at over 40kw, which should
| cover any domestic requirement.
|
| It was this sort of statement that used to land IMM in hot water, since
| it assumes one size fits all and ignores many real world situations.
|
| You assume the cold main can supply that rate - often it can't. You
| assume that there is no requirement for simultaneous use (i.e. bath +
| shower or two showers etc), you assume the shower is not of an elaborate
| body jet or soaker head type that requires high flow rates, you ignore
| that continously variable temperature output of any instantaneous water
| heater that has to cope with variable flow demands, you ignore the cases
| where insufficent capacity reamins on the 60kW rated gas supply. You
| ignore those users with unreliable water supplies.

Your house is an hotel, rather than a home?
--
Dave Fawthrop dave hyphenologist co uk
"Intelligent Design?" my knees say *not*.
"Intelligent Design?" my back says *not*.