Hello,

We have recently had a new boiler system fitted which is unvented without any feeder tanks.

Previously, we used to add inhibitors/additives into the feeder tank in the loft (Vented system) for the radiators.

How do we add them now to an unvented system?

Thanks.

You can get inhibitors etc in cartridges and inject the contents with a
cartridge gun into a radiator vent or via the filling loop on the system.

"M.Joshi" wrote in message
...

Hello,

We have recently had a new boiler system fitted which is unvented
without any feeder tanks.

Previously, we used to add inhibitors/additives into the feeder tank in
the loft (Vented system) for the radiators.

How do we add them now to an unvented system?

Thanks.




--
M.Joshi

On 2007-04-24 20:34:11 +0100, M.Joshi said:


Hello,

We have recently had a new boiler system fitted which is unvented
without any feeder tanks.

Previously, we used to add inhibitors/additives into the feeder tank in
the loft (Vented system) for the radiators.

How do we add them now to an unvented system?

Thanks.

You can buy a gel form which can be injected into a radiator vent using
a mastic gun.

"Andy Hall" wrote in message
...
On 2007-04-24 20:34:11 +0100, M.Joshi said:


Hello,

We have recently had a new boiler system fitted which is unvented
without any feeder tanks.

Previously, we used to add inhibitors/additives into the feeder tank in
the loft (Vented system) for the radiators.

How do we add them now to an unvented system?

Thanks.

You can buy a gel form which can be injected into a radiator vent using a
mastic gun.


If you want to use a traditional type rather than the overpriced injector
type - then isolate a radiator, drain it by loosening the union then after
re-tightening it - open up the top bung - if it has one and pour in the
additive. then re-open the valves.

If your newer rads don't have top bungs then disregard this.

In message , John
writes

"Andy Hall" wrote in message
...
On 2007-04-24 20:34:11 +0100, M.Joshi said:


Hello,

We have recently had a new boiler system fitted which is unvented
without any feeder tanks.

Previously, we used to add inhibitors/additives into the feeder tank in
the loft (Vented system) for the radiators.

How do we add them now to an unvented system?

Thanks.

You can buy a gel form which can be injected into a radiator vent using a
mastic gun.


If you want to use a traditional type rather than the overpriced injector
type - then isolate a radiator, drain it by loosening the union then after
re-tightening it - open up the top bung - if it has one and pour in the
additive. then re-open the valves.

Vertical towel rads in the bathroom are good for this, as the top of
these tends to be above all the others. I would then just open the main
drain cock downstairs, drain off a bit , add the inhibitor.

I've done it as you describe via a normal rad, using a bit of flexible
plastic pipe, a suitable threaded fitting on the end and a funnel.

whatever you do, don't forget to check/repressurise the system
afterwards
--
Chris French

[/i][/color]
If you want to use a traditional type rather than the overpriced injector
type - then isolate a radiator, drain it by loosening the union then after
re-tightening it - open up the top bung - if it has one and pour in the
additive. then re-open the valves.
[/i][/color]
Vertical towel rads in the bathroom are good for this, as the top of
these tends to be above all the others. I would then just open the main
drain cock downstairs, drain off a bit , add the inhibitor.

I've done it as you describe via a normal rad, using a bit of flexible
plastic pipe, a suitable threaded fitting on the end and a funnel.

whatever you do, don't forget to check/repressurise the system
afterwards
--
Chris French[/quote]


Thank you all for your replies - We do have newer radiators and a couple of towel radiators. The filling loop is actually a screw valve on our system connected to the main water inlet and isn't removable.

On the newer radiators, there is a vent nut on one end and a plain nut on the other - Which end should the additives be injected into?

Also, what pressure level should the gauge show on the boiler - just above the red (Minimum) or in between the minimum and maximum mark? I have noticed that this has gone right down a couple of times?

In message , M. Joshi
writes

On the newer radiators, there is a vent nut on one end and a plain nut on

the other - Which end should the additives be injected into?

It doesn't matter, just remember that if you remove the vent one to
remove the whole plug, not just the vent screw.

Also, what pressure level should the gauge show on the boiler - just

above the red (Minimum) or in between the minimum and maximum mark?

It should specify the correct pressure in the boiler manual. Normally
they seem to be about 1.5 BAR

I

have noticed that this has gone right down a couple of times?


If it is going down, and you are having to top up the system to
re-pressurise, then there is probably a small leak somewhere
--
Chris French

On Wed, 25 Apr 2007 19:27:28 +0100 someone who may be M.Joshi
wrote this:-

The filling loop is actually a screw valve on our
system connected to the main water inlet and isn't removable.

As I understand it that is in contravention of the rules.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

M.Joshi wrote:
Hello,

We have recently had a new boiler system fitted which is unvented
without any feeder tanks.

Previously, we used to add inhibitors/additives into the feeder tank
in the loft (Vented system) for the radiators.

How do we add them now to an unvented system?

Two ways. The Fernox system which injects into a rad using a mastic gun, or
the much cheaper Wickes system where you get a small pump that removes about
650ml from a rad, then pumps around 500ml of concentrate into the rad.

The Wickes system is 2/3rds of the price, and the pump is reuseable. The
Fernox system using a mastic gun injects under pressure & I have found the
cartridges sometimes leak back where the plunger is, wasting concentrate &
making a mess.


--
Dave
The Medway Handyman
www.medwayhandyman.co.uk
01634 717930
07850 597257