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Has anyone ever used silicone grease in the wet parts of a heating system? e.g. pump, diverter etc - I have on occasion come across valves that get a little sticky which could do with some cleaning and I would imagine some waterproof grease would do wonders but I am not sure about longevity of...

Has anyone ever used a dosing vessel for a boiler filling loop ? I need to use some DS40 to clear some muck off the heat exchanger, the boiler will be isolated from the rest of the system since the rads have already been cleaned and I don't want to redo everything again.

Has anyone done this before ? The CH is clean but the boiler has some gunk and scale build up and I was thinking of isolating and doing a chemical power flush to clear it out (don't want to drain system down).

Does anyone know of any brand Smart TRVs that don't require a control unit and can be setup and controlled individually ? I need to set day/night temps and hours.

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 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...

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

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.

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.

What's the best strategy to install a designer rad (although this is applicable to all radiator types) ? By that I mean getting the brackets installed correctly so that the rad sits on all 4 brackets instead of the top two or bottom two, whilst also ensuring the pipes line up and fit into their...

I've got a few jammed radiator stop cocks. If I pull them out by force, can I keep the stop cock and just replace the seal or must I replace the whole thing ? If I need a rubber seal, can someone advise which seal I require.

If a cylinder has a high turnover, can the water temp be lowered ? Since a major contributor to Legionella growth is stale water, hence heating it above 60c. If the cylinder water has a turnover of 2-3 per day, can the temp be lowered to 30-40c ?

I've set up weather comp with a viessmann 100-w B1KF (2021 model) with a thermostat. The thermostat temp reads 22.1c, the boiler's desired room temp is set to 23c. However, I have notice that the boiler will run for 20min then the burner turns off whilst the pump is still running, then 10-20min...

Is using demineralised water in the CH, is inhibitor required ?

When looking at radiators, what is meant by "tapping centre" ?

How do I tighten the water inlet nut for the fill valve without the whole mechanism moving ? Right now, I have to grab the whole thing and there is a chance I might break a plastic piece or something. Surely, there must be another way.

When talking about boiler sizing, how does one make sense of the kW rating. Lets say we have 2 heat-only boilers for CH, one is 11kW and the other is 19kW - Is this rating related to water output or max temp ?