It's so you have a supply of cold water in case of overheating and prevents boiling .this could not happen if accidentally left closed or becomes blocked. You would not want a system running dry would you ?
Thanks, for that, I did wonder about that at one point but discounted it because a service valve is allowed in the cold feed to the tank and that could be accidentally left closed and a F&E tank doesn't have much capacity.
I also thought that a hot water cylinder could overheat and the same thing happen, although I suppose that the element would burn out before it ran dry and so not quite as risky as a boiler.
Is ths the Netaheat with an asbestos box around the burner ?
I was always told not to service these boilers because of that asbestos but that was a 15 years ago and i can't quite remember if it is that model.
(to much stella over the years)
Anyway these boilers have no overheat stat but i think you COULD get a kit for them.
That is the correct instruction because it cannot be assumed if the boiler is boiling that the feed water will be able to also flow down the pipe to replemish whats being boiled off.
Many of those vintage of boilers actually had the cold feed entering directly into a dedicated tapping on the boiler.
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