IMM wrote:

The Mira 415 is the one to go for. Dedicated to mains pressure systems. It
is not thermostatic and has an integral pressure balancing valve. The combi
provides the constant temperature, so no need for a thermostat cartridge in

Why do you say the combi provides a constant temperature? Even
modulating combis with a maximum water temp thermostats will vary
temperature in inverse proportion to requested flow rate (the max temp
rising up to the cap set by the stat at low flow rates)

So if you have the boiler stat set to limit at 60 degrees and draw off 8
l/min then the temp will be 60 deg. If the dishwasher then decides to
take the total hot water flow rate to 15 l/min the temperature will have
to fall. How does the pressure balance cope with that?

(I can see how it would work well on a unvented HW cylinder for example,
because the HW flow rate would not affect the temperature of the water)


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/