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If there is no other leak and the toilet is fine, its almost guaranteed to be an underground leak. Like I said, you need to move fast, you could be pushing up to 100L per day into the concrete. Wet tiled concrete will take years and will cause significant property damage (damaged flooring, wet...

I mean obviously PPE + baking pwoder goes without saying. He seems competent enough to get this far.

This post is for future end users looking for solutions to this problem (diverter banging/replacement). Viessmann is a German made product and Germans have very high standards with regards to water purity/quality i.e. VDI 2035. Unfortunately, similar standards are only a recent thing in the UK...

A bit of acid may get things going enough for the wet vac.

Can you isolate your toilet feed ? or at least put an isolator in ? How old is the pipe work ? Since its the cold water feed, how is your mains pressure like ? This sounds like a pin-hole leak coming from an underground pipe in the property. You should address this very quickly otherwise the...

But then does the reverse osmosis system need to remove everything ? I think the focus should be on reduction, not elimination. Lets say your property has a hardness of 375ppm, you can set up a RO kit to bring it down to 200ppm by mixing filtered/unfiltered water - this would mitigate the low...

Has anyone worked on a viessmann 100-w combi before ? I need to replace the diverter valve - I unscrewed it from the hydraulic block but for the life of me I can't get it out. I even spoke to Viessmann tech and they advised twisting and yanking hard but this tosser is not budging AT ALL. Is...

Can someone recommend a good descale for heating systems that works quickly on a 12 rad system ?

I have an old skylight from the 90s. The mechanism to open and close it is a bar which you rotate. The bar itself is connected to the wall which allows you to push the skylight up. Does anyone know what this mechanism is called ? I lost a clip whilst doing some repair and can't seem to find...

I guess you can say I am a little too eager - doing loads of reading - and am way ahead of the current material (which is a bit boring tbh). When you say there needs to be more 28mm than 22mm, is there a ratio or method to this ? I am going off the flow rates on the sizing sheets and everything...

I'm studying towards it, still pretty fresh and loads to learn but moving along quickly.

I have one more question, is it acceptable to mix and match sizings ? Lets say I have a 12m run on a 22mm pipe that is powering 2 boilers - both boilers have a collective flow rate of 5.6m3. 22mm @ 12m has a max acceptable flow rate of 3.9m3. What if for the first 6m I ran a 28mm, and use 22mm...

I am currently studying gas pipe sizing calculations and am somewhat stumped by the flow rate. Since the flow rate is based on m3/per hour, how is this established ? Is it based on the max output of the appliance per hour ? Lets say I have a 30kW boiler running at max, this would convert to...

viessmann 100-w 2021 model. I've seen temp differential thrown around a few times - what exactly is it ? and how does it differ from ErP ?

What exactly does combi modulation do ? does it modulate just the burner ? or does it also include the CH pump too ?

In what sense ? more kw or more effective at actually delivering the stated flow rate ?

Is a natural gas tankless water heater a better option than a modern combi for heating hot water ? I am wondering whether one is more efficient than the other in any sizeable way.

Does anyone know where I can get a good priced demin kit for CH ? Spent 200 quid on a puratap micro, and its knackeredd after 2 use.

@stem What model is the HP ? It sounds like the HP might be undersized ? Is the building temp comfortable ? Also, do you know if your friend's house is draughty ? and whether he has decent mechanical ventilation ? Opening windows and trickle vents with a low-temp heating system can kill efficiency.

Since the gov is mulling over a gas boiler ban in 2025, has anyone had any experience with HPs ? this seems like another car crash in the making.