Oil Boiler connections

[karltimber]

I am currently plumbing an ext and need some advice.

I am using a 4 pipe system - 2 to rads and 2 to domestic hot water tank.
I have the 4 * 1inch pipes at the location where the internal oil boiler is going.
There are two flows (high on the boiler) and two returns (low) on the boiler.

Question - do I put rad pipes on one side and the dhw pipes on the other.

Q - I want to be able to turn off the rads (and just heat dhw) by means of a wired remote switch. what type of valve is used for this and on which pipe would it be installed.

thx folks.

 

[collieb]

I think you would normally have only one flow and return actually physically connected to the boiler, and then split between DHWS and rads.

The valve u are talking about is a motorised isolation valve, usually located in the hot press, and this is automatically controlled by the thermostat. You can have as many of these valves as you want, depending on the number of separate zones you wish to have.