On 2007-12-24 20:00:40 +0000, fred said:

In article , Ed Sirett
writes
On Sun, 23 Dec 2007 19:10:40 +0000, fred wrote:

Andy had me worried there for a minute but it looks like they have
introduced the Qudos 28 as a mid level domestic replacement that fixes
some of the original issues I had with the Celsius 25. There are
separate control temperatures depending on the demand source with
thermistor sensor modulated control of DHW temp and they promise
compatibility with low grade heat from solar panels in the future. Full
list is: Room Compensation, Weather Compensation, Solar Control,
Modulating DHW Reheat, Solar Thermal, Analog Demand (0-10VDC), External
Lockout Signal, Remote Fascia Panel plus LCD control panel and display
of system params (flue temp, flow/return temp, other temp densors) in
installer mode. They've retained the 20m/50mm maximum flue length and
even extended it to 60m when increased to 65mm. Suffix H is heat only
without pump or expansion vessel, suffix S is a system unit with those
parts incorporated.

£722.08 and £788.13 inc vat for the 'H' & 'S' respectively at
discountedheating.

I'm quietly impressed.

This boiler would have the most sophosticated controls of any in that
price bracket.

The sophistication and the solar hook makes it attractive to the
specialist market and the techies here but I do wonder whether it will
make it in the mainstream market, it's just too clever. I hope that
they and it make it, at last a company who listen.

You don't have to use the clever bits.

It will work with just a simple switched live for the followers of Ned Ludd.

I doubt whether many people would use it domestically with more than a
thermostat and the weather compensator. The smart move would be to
include the sensor for that in the package because it's a very low cost
item (basically a two wire semiconductor in a weatherproof box).

It may be interesting for small commercial installations involving
multiple boilers controlled by an analogue or Opentherm controller.

Whether it makes it in the market will depend on the number of puffy
anoraks for Plumbcenter counter staff and lunches for their managers.