Jim D wrote:
On 16 Oct 2006 12:17:00 -0700, "Mr Harry" wrote:

what problems have you had so far? are the faults connected, somehow?

Some faults were connected; others weren't:
1) Secondary heat exchanger got clogged with bits of iron oxide.

No secondary heat exchanger on my system boiler.

2) The next one got clogged with limescale (hard water area).
Indirect heating of hot water means scale would be in cylinder anyway,
but I got a softener. So no scale problems anywhere.

3) Third one went the same way
4) So I installed a phosphate doser.

More fool you for not fitting a proper softener from the word go ;-)
5) Had to replace CH flow switch,

Ah. No flow switch on a system boiler.

6) Replaced CH control thermistor,
7) Replaced pressure release valve
8) Expansion vessel failed. Installed stand-alone one.

Mmm. No problems like that on whatever it is I have.

Just had a two way motorized valve stick and screw up the motor.


That's about it over the past 8 or so years. I've certainly spent more
on parts than I spent on the original boiler.

On the other hand, folks seem to have traditional-type boilers that go
year after year with no problems. But that's just my impression.

Jim D