How an Unvented Cylinder and Central Heating Work

Smashing video, mate. I couldn't fathom what was going on with my heating system or how it worked. After watching, I'm pretty sure I understand mine now. Thank you

Thanks for this great video! It helped me a lot to understand how the heating and hot water system in our house. Now at least I would have some idea where to look in case of some issue.

Wowsers it should be in a museum a work of art

Amazing system, nicely done indeed

Nicely explained great video. Thank you. 👍🏻👍🏻

Great job and well explained mate well done 👍🏼 😊❤

Great. I've just had a system boiler installed. Had a combi previously. I didn't really know how the new set up worked (I asked the installer, who was good, but he didn't have the communication skills to explain to a layperson) and was a bit in limbo about how it all works. You, sir, are the 'James Milner' of explaining how domestic boilers work: one who learnt Spanish in order to communicate with team mates better :-).

Very good bro 👍

Very informative

Hi nice copper work. Do you need a tempering valve off your domestic hot water feed?

Great video explaining how an unvented system works. One question, you mentioned that an unvented system prevents a drop in pressure when 2 showers are working at the same time. However, in my home I still lose a lot of pressure. Any ideas why? I have an unvented megaflo tank in a cupboard on the 1st floor, which is connected to a system boiler located on the 2nd floor.

If you are a property owner looking to get an upgraded heating system, always ask to have the system installed ready for a heat pump. Everything would remain the same but your radiators and pipe sizing is adjusted to suit lower flow and return temperatures, also ask for weather compensate and hot water priority. This will save you money on fuel consumption. Obviously all depending on heat loss so it may mean you need to have extra insulation in your property. This is how I’m moving forward in my new heating gas installation so it’s all ready for the transition to air source heat pump, but is still super efficient on a standard gas heating set up

Brilliant did you have any part numbers as I was interested in getting the pressure gauge to see the pressure just like you have configured and also the automatic air release as you have. Thanks in advance.

With the unvented systems do you have pressure regulation for all cold feeds in the property, I'm thinking about balanced pressure across mixer taps shower valves etc, I imagine there would be a pressure regulator right after the stop cock in this instance.

Thanks for a great explanation video. It seems we have a similar system with an expansion tank, hot water cylinder, pump, wiring centre..etc in a cupboard on the 1st floor of our house and the boiler is on the ground floor. Our expansion tank needs changing due to the rubber membrane splitting (water escaping from the shrader valve and not air!). Do you think I can drain off the water from the expansion tank from the filling loop without the need to do it from a radiator before replacing the tank? Or is there a better method. Your help would be much appreciated!

Great vid thanks mate really apreciate it

Interesting idea to use the Nest's hot water switching for your second CH zone. I am trying to decide whether to repurpose a 34KW Valliant combi and fit an unvented cylinder with it, but it a tough call because it is a pretty big expense and the only issue we face is running two concurrent showers. Do you think it would make much difference to shower performance? We have over 50l/m incoming supply (Since upgrading it) but the boiler can only heat about 14l/m at best. One shower alone is pleasant but two at the same time becomes weak.

Nice vid mate. Also turn your cylinder stat up to 60 to avoid legionella buildup ;)

Great video! I don’t have hot water and what will be the problem ? The heating seems working fine. thanks

Really nice video and well done - thanks. I'm curious to know - how did you navigate the requirements to have qualifications such as G3 certification for unvented systems as a DIYer? Cheers