Never had a combi, but parents house has a Baxi 100HE

Thinking it would be a good idea to flush, run a system cleaner, then
install inhibitor. I have bottles of those for free.

How do you install these into a combi ? ..... the products are just
standard plastic bottles.

There is an alternative of an aerosol that I assume can use via filling
loop but I would then be paying £15 a bottle.

Is there some trick to getting into the system.

Only option without cracking open boiler would be via a rad .... but air
vent hole is tiny and these bottles have large diameter tops.

Turn off radiator valves - bleed air. Remove a top bung off the radiator.
Loosen bottom connection to drain enough water. configure some way -
perhaps empty washing up liguid bottle - to squirt inhibitor into radiator.
Replace bung, turn on valves, bleed and run the system.

On 17/06/2020 20:15, rick wrote:
Never had a combi, but parents house has a Baxi 100HE

Thinking it would be a good idea to flush, run a system cleaner, then
install inhibitor.Â*Â* I have bottles of those for free.

How do you install these into a combi ? ..... the products are just
standard plastic bottles.

There is an alternative of an aerosol that I assume can use via filling
loop but I would then be paying £15 a bottle.

Is there some trick to getting into the system.

Only option without cracking open boiler would be via a rad .... but air
vent hole is tiny and these bottles have large diameter tops.

When the gas man did mine, he put it in through a valve at the top of a
tall towel rail.

--
Max Demian

On 17/06/2020 20:15, rick wrote:
Never had a combi, but parents house has a Baxi 100HE

Thinking it would be a good idea to flush, run a system cleaner, then
install inhibitor.Â*Â* I have bottles of those for free.

How do you install these into a combi ? ..... the products are just
standard plastic bottles.

There is an alternative of an aerosol that I assume can use via filling
loop but I would then be paying £15 a bottle.

Is there some trick to getting into the system.

Only option without cracking open boiler would be via a rad .... but air
vent hole is tiny and these bottles have large diameter tops.


I removed the air vent from the top of one of the radiators after partly
draining the system. The Fernox I bought came in a bottle with a small
plastic pipe that fitted in the hole. A washing up liquid bottle might
well be a suitable container for squirting liquid into a radiator.

On 17/06/2020 20:15, rick wrote:
Never had a combi, but parents house has a Baxi 100HE

Thinking it would be a good idea to flush, run a system cleaner, then
install inhibitor.Â*Â* I have bottles of those for free.

How do you install these into a combi ? ..... the products are just
standard plastic bottles.

The same as any other sealed system...

(combi is not synonymous with a sealed system. Most (bit not all) combis
use a sealed system, but plenty of other non combi boilers also have
sealed systems)

There is an alternative of an aerosol that I assume can use via filling
loop but I would then be paying £15 a bottle.

Is there some trick to getting into the system.

Only option without cracking open boiler would be via a rad .... but air
vent hole is tiny and these bottles have large diameter tops.

You can do it at a rad. Close both valves, then drain a litre of two of
water by undoing the union nut on the rad side of the valve. Open the
air vent to let some water out. Re-tighten the union nut, and remove the
entire bleed screw plug or the blanking plug and pour the does in with a
funnel and a short length of hose.

If you have a magnaclean style filter, then they are also an easy place
to dose. Isolate with its taps, drain, and refill with inhibitor.



--
Cheers,

John.

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Rick posted
Never had a combi, but parents house has a Baxi


Have,you reason to believe there isn't inhibitor already in the system?

On 17/06/2020 20:15, rick wrote:
Never had a combi, but parents house has a Baxi 100HE

Thinking it would be a good idea to flush, run a system cleaner, then
install inhibitor.Â*Â* I have bottles of those for free.

How do you install these into a combi ? ..... the products are just
standard plastic bottles.

There is an alternative of an aerosol that I assume can use via filling
loop but I would then be paying £15 a bottle.

Is there some trick to getting into the system.

Only option without cracking open boiler would be via a rad .... but air
vent hole is tiny and these bottles have large diameter tops.


Ended up taking out bung from rad ... lucky only one rad had this type
of fitting, others are older Stelrad units with welded in air bleed at
one end and no bung at other.

Used a funnel with a price of pvc hose .... fiddly but got it done.


At least in searching for 'inject point' I found out it has a magnetic
'filter unit' ... drained that, loads of magnetite crud came out.

Interesting watched British Gas do annual service and he never touched
this valve .... and its supposed to be drained annually.


Got system well hot, now off, will leave it soak for 2 weeks then drain,
flush and put inhibitor in.

In message , rick
writes
On 17/06/2020 20:15, rick wrote:
Never had a combi, but parents house has a Baxi 100HE
Thinking it would be a good idea to flush, run a system cleaner,
then install inhibitor.** I have bottles of those for free.
How do you install these into a combi ? ..... the products are just
standard plastic bottles.
There is an alternative of an aerosol that I assume can use via
filling loop but I would then be paying £15 a bottle.
Is there some trick to getting into the system.
Only option without cracking open boiler would be via a rad .... but
air vent hole is tiny and these bottles have large diameter tops.


Ended up taking out bung from rad ... lucky only one rad had this type
of fitting, others are older Stelrad units with welded in air bleed at
one end and no bung at other.

Used a funnel with a price of pvc hose .... fiddly but got it done.


At least in searching for 'inject point' I found out it has a magnetic
'filter unit' ... drained that, loads of magnetite crud came out.

Interesting watched British Gas do annual service and he never touched
this valve .... and its supposed to be drained annually.


Got system well hot, now off, will leave it soak for 2 weeks then
drain, flush and put inhibitor in.

er.. can't you use the magnetic filter as a fill point?
Drain/fill/circulate/drain/fill... until you have got the full amount
loaded?


--
Tim Lamb