We have a WB 24 CDI combi that doesn't have an externally mounted
room stat fitted, although one can be connected.

All of the radiators have stats on - am I right to assume that the
boiler has an internal stat that senses the (heating) water temperature
as it flows though the system and adjusts dependant on how high up
front panel knob is turned? - Or does the water just get heated to a
higher temperature irrespective of the heat lost via the radiators?

I'm wondering if there are any advantages to having a room stat for
this boiler.

Thanks.

Sean wrote:

We have a WB 24 CDI combi that doesn't have an externally mounted
room stat fitted, although one can be connected.

All of the radiators have stats on - am I right to assume that the
boiler has an internal stat that senses the (heating) water temperature
as it flows though the system and adjusts dependant on how high up
front panel knob is turned?

Probably not: my guess is the lazy and/or ignorant installer skimped on it.
What does it say in your Benchmark log book under Time/temperature control
fitted?

I'm wondering if there are any advantages to having a room stat for
this boiler.

Energy efficiency, compliance with regs and longer life of the boiler.

errrmmm .... there is just a set of instructions, no log book.

So am i right to think that there is a stat in the boiler that is the
only temp control for the CH system?

I'm wondering if there are any advantages to having a room stat for
this boiler.

There is a legal requirement to have one fitted for energy efficiency
reasons (at least for new installations and replacement boilers), unless an
alternative form of "boiler interlock" is provided. However, any installer
specifying a 24kW combi sounds like the sort of cheapskate that wouldn't
even know what a boiler interlock was.

Without one, your boiler will be churning away wasting energy even when your
house is hot.

Christian.

On Wed, 14 Dec 2005 01:47:13 -0800, Sean wrote:

errrmmm .... there is just a set of instructions, no log book.

So am i right to think that there is a stat in the boiler that is the
only temp control for the CH system?

The log book if found will be either a couple of pages in the instruction
manual or a Bluish A4 card folded in A5. Alas, not having the look book is
the going rate.

The only other control will be the valves on the individual radiators.
The boiler will have an adjustable setting for the radiator temp, that's
all you have. If this system was installed after 1/4/5 if was not done
legally. If before it was simply defective.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html

Can you explain what you mean by your phrase

"However, any installer
specifying a 24kW combi sounds like the sort of cheapskate that
wouldn't
even know what a boiler interlock was. "

Arent you making an assumption on the size of the house the boiler is
fitted to?

There is obvioulsy some form of stat in the boiler itself as it does
turn on/off and does seem to maintain a level temp.

"However, any installer specifying a 24kW combi sounds like the sort
of cheapskate that wouldn't even know what a boiler interlock was. "

Arent you making an assumption on the size of the house the boiler is
fitted to?

Nope. It is a combi, which is sized for water demand, not the size of the
house. 24kW is only just OK for a shower.

Given the marginal price difference between a 24kW and a 28kW, it seems
pointless saving yourself two pounds fifty and losing the extra power, which
makes all the difference in such a marginal installation.

Christian.

In article .com,
Sean wrote:
"However, any installer
specifying a 24kW combi sounds like the sort of cheapskate that
wouldn't
even know what a boiler interlock was. "

Arent you making an assumption on the size of the house the boiler is
fitted to?

It's too small to supply a decent flow of hot water.

--
*Marathon runners with bad footwear suffer the agony of defeat.*

Dave Plowman London SW
To e-mail, change noise into sound.

Now i'm wondering who i can believe on here - the boiler has been
running for 4+ years in a large 3 bed house with 8 rads connected and
other than the usual moans about having to wait 10 minutes to fill a
bath no one has moaned about the lack of heat output from it.

My initial question has only been promted by the fact that the recent
tennants have left giving me the opportunity to carry out some work -
including (if needed) a remote room stat.

If i undertsand the responses so far i'm looking at having to replace
the boiler - or have i missed the point?

If i undertsand the responses so far i'm looking at having to replace
the boiler - or have i missed the point?

There's no need to replace the boiler. The type of boiler was just mentioned
in that it supports the idea of a penny pinching attitude by the installer.
Adding a room stat to the existing setup is a very good idea. The best room
for it is the lounge, provided it doesn't have a separate heater, like a gas
fire. In the room with the stat, you must remove any TRVs on the rads and
replace them with lockshield valves that the tenants can't turn off. Ensure
all the other rooms do have TRVs on them.

Christian.

In article . com,
Sean wrote:
Now i'm wondering who i can believe on here - the boiler has been
running for 4+ years in a large 3 bed house with 8 rads connected and
other than the usual moans about having to wait 10 minutes to fill a
bath no one has moaned about the lack of heat output from it.

The heat output is more than adequate for the CH - just not for the hot
water as you've discovered.

--
*Who are these kids and why are they calling me Mom?

Dave Plowman London SW
To e-mail, change noise into sound.

On Thu, 15 Dec 2005 16:57:47 +0000, Christian McArdle wrote:

If i undertsand the responses so far i'm looking at having to replace
the boiler - or have i missed the point?

There's no need to replace the boiler. The type of boiler was just mentioned
in that it supports the idea of a penny pinching attitude by the installer.

Whilst I agree the difference between the 24kW and 28kW boilers
is only marginal. (Maybe the gas pipework was not good enough to support
28kW?)

If the original installer truly penny pinching then he would have
installed a HeatLine/Biasi/Ravenheat/Wickes/Halstead or similar. The
difference to a B-W would have been several hundred quid. Although not
fitting a room thermostat was a truly dire ommission.



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html