Identifying heating flow and return pipes on boiler.

[Rampage]

I have a boiler that powers the central heating and hot water storage tank with no valves.
I am going to add an extra Zone into the central heating.
From the boiler there are 2x 22mm pipes and 2x 28mm pipes. I need to know which ones to fit the 2x 2-way valves into. I can't see where the pipes come from on the boiler, just where they come out under the floorboards.
When I turn the central heating on its the 22mm pipes that get hot, so it's these ones I need?

 

[Dan Robinson]

Yes, but I suspect this is the least of your troubles.

 

[gaswizzard]

 

[Rampage]

Yes, but I suspect this is the least of your troubles.

What do you mean?

 

[Garfeild]

Are you running extra pipework to an extension or something?
Or are you thinking you can separate the existing house by
Fitting zone valves without altering pipework?
Which you can't.

 

[Nige F]

I have a boiler that powers the central heating and hot water storage tank with no valves.
I am going to add an extra Zone into the central heating.

Don`t bother zoning You`ve got an OLD system with gravity primaries to the hot water cylinder - If you mean by zone you just want to add a rad or two - then extend the flow and return pipes from a nearby rad . Zones are for fuel economy and new regs. You`re better off fitting Thermo. rad valves

 

[Rampage]

The purpose is to create a seperate zone for the heating in my pond. Thus I need two seperate zones that will heat independantly.

 

[HERTS P&D]

POND Did you say POND?

Get a pond heater.

Andy

 

[Rampage]

I'm using a heat exchanger designed for a pond.
'Pond heaters' are designed to keep a part of the surface free from ice. Or you can get more powerful inline versions, but electric is far more expensive than gas!

 

[DaleRCL]

Trying to zone off a gravity central heating heating system into 3 zones is quite an involved job. Even for someone experienced. If I were you I would get in a pro to do it or find some another way to keep your pond warm. Even if the electric pond warmer you mention is expensive to run, it surely isnt going to cost more than what it would to do the plumbing work you are talking about doing.

 

[Rampage]

I've got all the parts now!
Its a similar cost installing electric vs gas if I do it myself. I had a quote for someone to fit the valves and it was considerably more than I expected!
I'm following the way of doing it that they suggested though.