Sharp Sales Practice?
Ash wrote:
most combi work on a similar principle (?) that they heat hot water
for the central heating/radiators on one system and the heating of
the hot water is a separate system and both systems are contained
within the combi.
The two water paths are separate, but they're not completely independent
systems. To heat hot water, the "central heating" water is heated by the
gas and then, instead of going round the radiator circuit, it's diverted
through a heat exchanger to transfer its heat to the hot water side.
The query my mother has raised is that the heating engineer has said
that she needs a Magnaclean filter fitting to stop the hot water heat
exchanger furring up again.
[...]
To me the Magnaclean will only stop the sludging of the radiators of
the central heating and will have no effect what-so-ever on the heat
exchanger ... am I right?
Depends on what the actual problem with the heat exchanger was. If it
was blocked on the hot-water side then the filter seems unlikely to help
(unless there's some odd effect where sludge in the other side causes
less-even heating and consequent problems). If it was blocked on the
other side, which is actually part of the central heating water, then a
magnaclean doesn't seem unreasonable.
Pete
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