Boiler controls

[dawoodseed]

The sort with an indirect heating coil are the only sort that a boiler may heat. The boiler control system is arranged to heat either the cylinder and/or the radiators independently.

Does this mean the boiler will not be heating the cylinder when CH is on?

Will any valves be needed?(2 port valves etc)

I'm planning to get the Drayton lifestyle weekend/weekday programmer, it seems very easy to use and I also like the Advance buttons, it also allows separate timing for CH and DHW.

[Ed Sirett]

When I said that it was in the context of Unvented Hot Water Cylinders (Megaflows).

Since I don't know what you already have in terms of controls and a hot water cylinder, zones valves etc. I can only comment generally.

It is possible to set up a system so that the heating and hot water are fully independent. There may be times when both are needed at the same time. In that case there are two approaches, one is to just make no alterations to the pipework, this may allow the cylinder to take all of, most of, or too much of the boiler's output away from the house heating. However this won't be for very long, with a modern cylinder, and the arrangement may not cause any noticeable problems. If you are the sort of person who is away a lot and then comes home and puts both the heating and hot water on then it might delay the effective heating for a while.

The alternative approach is to restrict the heating of the cylinder so that the house heating is not affected or less affected. This is usually done by adding a gate valve in series with the cylinder coil. Often these valves will be specifically tamper unfriendly (called lock shield valves), as inadvertent (or ignorant) adjustment could cause a problem.

In general heating contorls will have two 2-port valves. Some installation have one 3 port valve. The 3-port valve arrangement is somewhat deprecated these days.

[dawoodseed]

Strange,no replies,all must be busy for Christmas I suppose