Hi Guys, hope you can help with this..

I am fitting a heated towel rail located between the boiler and the pump.

I have identified available pipes as 22mm flow from boiler (to pump and 3
port valve), 22mm CH return, and 15mm HW return.

If I connect into 22mm flow the towel rail should be warm whenever the
boiler is on, but where should the return connect, to the 22mm CH return or
the 15mm HW return? Or even to 22mm flow?

Thanks for any advice

--
MikeR

MikeR wrote:


> If I connect into 22mm flow the towel rail should be warm whenever the
> boiler is on, but where should the return connect, to the 22mm CH return or
> the 15mm HW return? Or even to 22mm flow?


22mm CH return.

Then adjust the valve on the return side of the towel rail to about a 
1/4 of a turn off closed is a good place to start. If it doesn't get 
warm at all open it a little more. It will only need to be opened a very 
small amout though.

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In an earlier contribution to this discussion,
MikeR   wrote:


> Hi Guys, hope you can help with this..
>
> I am fitting a heated towel rail located between the boiler and the
> pump.
>
> I have identified available pipes as 22mm flow from boiler (to pump
> and 3 port valve), 22mm CH return, and 15mm HW return.
>
> If I connect into 22mm flow the towel rail should be warm whenever the
> boiler is on, but where should the return connect, to the 22mm CH
> return or the 15mm HW return? Or even to 22mm flow?
>
> Thanks for any advice


Presumably the idea is that it should get warm whenever either (or both) HW
and CH are on - including in the summer when only the HW is on?

In that case, the feed needs to come from a point *after* the pump but
*before* the 3-port valve - otherwise it won't work. [This could present a
bit of a challenge if the valve sits right on top of the pump, like mine
does.]

Connect the return into the CH return pipe. As others have said, you'll need
to have the lockshield valve only just open in order not to starve the other
rads and HW coil of flow.
-- 
Cheers,
Set Square
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>> The flow should be connected between the pump and the input to the zone
>> valve(s).
>
> Thanks guys, so it wouldn't work then sited before the pump?


Not unless you could guarantee effective gravity flow.

Alternatively, you would need to plumb it in series with the boiler output,
but this would be frowned upon in a modern system.

Christian.