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Hi There is a whole sequence of GC numbers quoted on the front of the manual - photo attached. I haven’t noticed any major problems with the hot water up to now, although oddly enough my shower this morning struggled to get as hot as usual. Could be due to others using water before me, but it...

Hi Old boiler was Worcester Bosch Greenstar 24i system New boiler is Viessmann 100w system 35kw (although installer said he turned down to 28kw). Installer said he did balance radiators. Is the attached page what you wanted to see (I have excluded personal info)? As I said above, i haven’t...

Hi I know there have been other threads on this but none quite resolved my query. we had a new system boiler fitted two weeks ago, keeping our existing radiators. All fine. however, yesterday we noticed (for the first time I think) quite loud hissing from our main ground floor radiators. This...

I have two Geberit wall hung dual flush toilets with no access other than via the flush panel. Both have recently started intermittently filling the cistern for four/seconds every few minutes. Only one of the toilets was evidently leaking into the pan. Calling Geberit, they suggested...

To see if I understand point one, is this saying that even if all the radiators were correctly balanced, if it was operating efficiently I would need to add another couple of radiators in order to get the full 24kw of heat that the boiler is able to produce (as each rad would only output 85% of...

Thanks so much for this detailed and helpful response. I can't really claim to understand much of it, but I'm sure it will come in handy. I assume the first step is still to ensure the radiators are correctly balanced - is that right? And then consider these issues from there. A silly...

I have finally got round to measuring up my radiators, using the watt measurements on page 50 of the Stelrad catelogue (these seem to be the biggest of the Elite range). My set of 16 radiators comes out as follows: Stelrad Elite 50t Type Height Length Watts single 700 1000 1597...

Semi-detached house in Northern England, mix of wood frame single and double glazing, two 6m walls ( front and rear) and one 12m side wall, pitched roof with limited insulation, no wall cavities or loft insulation, four floors (although both basement and top floor are perhaps 60% of the house's...

:shock: I think I will be sticking with my 24i, even if it's too small! Another silly question, but best I check. I have assumed that the problem top floor radiators are only costing me for the heat they are producing. In which case, the fault isn't so bad as on full they are only as hot as I...

I have tried the boiler size calculator, which told me I need a 48Kw boiler :shock: This was worked out by applying the footprint of the house to all four floors. In actuality, the basement and top floor are a fair bit smaller, so three floors is a more reasonable calculation. This still...

It's a pretty big five bed Victorian semi with a number of large single glazed windows, so not at all energy efficient I fear. The boiler is in the converted basement, and the problem radiators are three floors up from there. I have read that the boiler pump should have different settings which...

Is there any concern that the Greenstar 24i system boiler would not be big enough?

We have moved into a large house with four floors and sixteen radiators in total (many large double ones). It is a relatively new installation with a Worcester 24i system boiler. The problem we have is that the two radiators on the top floor do not get more than lukewarm even with the TRV fully...

Can I ask for some advice on the recessed halogen downlights we are fitting for our lounge (around 12 x 12 feet)? We were initially advised that we needed to 9 or 11 lights so I have bought 11 low voltage fittings with an MR16 50W bulb in each. I now think this is far too much - both in terms...

I'm back, so here's some more. We used to get the odd rumble up there when we turned any of our cold taps off suddenly. A plumber replaced a washer in the cistern and that problem went away. It didn't stop the much more severe problem though. Most times the guy next door flushes his loo...

Generally strong water pressure, so I guess night time surges might be felt worse when next door's flush is the main local 'event'.

I would have thought the fact that turning the stop cock off eliminates the problem points to there being a surge through the mains. Is there any way that the neighbour flushing his toilet can cause a surge like this. Is it noteworthy that we only get the water hammer when he flushes his toilet...

Trying all I can :D

I hope someone can advise with the following problem. My home has a loft conversion which now has a bedroom and en-suite. The problem we have is that on an occasional basis the toilet cistern and the pipes behind vibrate violently like a pneumatic drill (and at least as loud). The vibration...