David Hansen wrote:
On Sat, 01 Mar 2008 13:15:22 +0000 someone who may be The Natural
Philosopher wrote this:-

Even the cost of copper to plumb them in these days..is pretty massive.

A 25m coil of 10mm copper tube is £33.21 according to Screwfix
http://www.screwfix.com/prods/17717/Plumbing/Copper-Tube-Accessories/Microbore-Copper-Tube-10mm-25m
I have spent more on a round of drinks in an Edinburgh pub.

Now why does tha noty surprise me?

I have never bought a round of drinks in an edinbrugh pub, Complete
waste of money.

But as we know, you don't count.

Why not work out how much CO2, is emitted,water and energy used, and
good food wasted, by malting barley and brewing a pint..




It is unlikely that many solar installations will need as much as
this, but let's be generous and say it is all used.

There will be some other copper components in the plumbing, but not
many. A few reducers to convert to the probably 22mm of the header,
pump valves, air vent, pressure relief valve, a couple of tees (air
vent and filling/expansion vessel/ pressure relief valve
connections). Let's be generous and say that takes the total to
£60.00.

Which is probably enough or three years of conventional ho
tw ter heated by and existing installation.,