Going on holiday in December. Will leave heating in holiday mode with a low setting of 15 degrees.
To avoid any water leakage issues - not frost realated - such as washing machine hose bursting or a joint coming apart, I would like to turn off the cold supply.
The boilers is a Worcester Bosch Combi and the heating is charged with a filling loop.
My concern is that if our "minder" comes in and turns on a hot tap - will it cause the boiler a problem. The boiler is in the loft.
I was wondering about that, since I got a combination boiler earlier this year & noticed that the heating circuit has a fancy filter in, but the hot water system doesn't. I take it the secondary heat exchanger is less "fussy" (with internal channel size, for example)?
I'm not sure that is so. My secondary heat ex glogged up (on the heat-in s ide) with rusty bits from the radiators. After that was replaced I fitted a filter in the CH circuit to catch the bits. that's probably why yours ha s a filter: the CH side is more prone to crud.
Robert
Some confusion here.
There are two heat exchangers in a combi, the normal gas to water one (which every boiler has) and the DHW heat exchanger (sometimes called the secondary HX).
It's normal to call the side which the heat comes from the "primary" and the output side, the "secondary".
The "heating circuit" consists of the secondary side of the main HX, the radiators, and the primary side of the DHW HX. This is the circuit which may contain rust from the radiators so a filter is not a bad idea. In my experience, a lot of combi problems come from blockage of the primary side of the secondary HX. I don't think there is much difference in geometry of the two sides of this HX, and there is generally less debris in the mains cold water (which goes through the secondary side). I suspect that clearances are more generous in the primary (hot gas to water) HX because the consequences of a blockage there could be relatively serious, ultimately a steam explosion.
Not sure if this makes everything clearer ;-)
It makes sense to me, FWIW. ;-)
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