Re: Plumbing in towel rail separately from the CH

In an earlier contribution to this discussion,
Lobster <davidlobsterpot601@hotmail.com>  wrote:

> Roger Mills wrote:
>>
>> In this position, water will circulate round the radiators whenever
>> the HW is being heated. That is why you need to turn off all
>> radiators *except* those in bathroom(s) which you *want* to get hot.
>
> Ah, OK.  I think I'm missing something though: what's the difference
> between doing that, and turning off all the rads except the towel
> rail, and then controlling the CH (which in summer would then
> comprise just the towel rail) separately as normal (ie, just having
> it come on for a quick burst at shower time)?
>

The difference is that it will then be controlled by the room stat - which
may decide that it doesn't need to come on. OK, you can turn the stat up to
max, so that it comes on for the whole timer period. But, with the HW demand
satisfied, and the boiler firing just for the towel rail, there may not be
enough flow to prevent the boiler from overheating.

With my method, the towel rail is controlled by the *cylinder* stat, and
only comes on while the HW is actually being heated.
--
Cheers,
Roger
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