unvented cylinder

Good evening all, I’m a drainage engineer with a plumbing background. My property is an old 1930’s, has an indirect vented cyclinder, f+e in loft and also water tank storage in loft. Would like to replace the vented with an unvented. Same location as existing, really good mains pressure on 15mm...

Hi, I've been quoted for a job from a plumber and he's quoting me for a Main direct unvented hot water cylinder. Does anyone know if this brand is any good? The name makes it very hard to search for it online as it keeps returning results for "mains".

The rising main in my downstairs bathroom looks like galvanised steel- 27mm by my measurements, which eventually joins to 15mm copper in the kitchen. I'm looking to tee off somewhere to feed an unvented cylinder, so need the best flow rate possible. My question is, would the flow rate be better...

I'm looking to upgrade my vented system to an unvented system, and as part of that I'm looking to upgrade the 15mm pipe from the stopcock to 22mm. We've got 25mm in to the house and the stopcock is in the downstairs loo, it's in the boxing in of the soil stack. The pipe run to the airing...

I'm putting in a completely new central heating system to feed radiators (150m2 of house across two floors - about 13 radiators) and provide hot water (1 shower, 4 sinks). For this, I'll be installing a Samsung 12kw Heat Pump and a 20tube solar thermal array (58mm hot tubes with alcohol fill)...

I have a heat only Worcester Bosch 30kw boiler and a 300L Ideal unvented cylinder. There are 3 zone valves, one for ground floor heating, another for 1st floor/loft heating and the last is for hot water. There is only one return pipe for the radiators. I had this and completely new pipework done...

Hello all, I’ve been pointed to this forum as a source for help in a question over heating / hot water systems. Apologies for the long winded post to follow! My 4 bedroom, 2 bathroom house was built on 1999 and is currently heated by a Potterton Supreme heat only boiler and a gravity fed hot...

Hi there, Recently had engineer out to our 11 year old Oso direct immersion water heater as it was slow dripping through tundish. He drained and refilled/reinstated internal air gap and no dripping now, however, when turned on it immediately starts making a slight whistling/squeal type noise...

Any advice appreciated... I have just had a complete replumb and new unvented cylinder and boiler installed. We only have 15mm inlet mains, but I seem to lose pressure and flow between the stop valve/outside tap and the upstairs bathroom. I have different flow rates and pressures throughout...

HI folks, Does anyone know if there are any rules regarding what size pipework should be used to pipe up an expansion vessel that's working with an unvented cylinder. I saw one yesterday that was installed with 15mm pipe to the combination valve, and I wasn't sure if this was acceptable or...

Hi, we are installing a megalflo type system in a new extension and we can have a cylinder with integrated expansion tank, like the Megaflo brand Sadia. We are going for megaflop cause the property is rather large now. I also think I need an indirect unvented cylinder, not direct. I also...

Next year I am having an unvented cylinder installed in a cupboard that currently has no electricity supply. I have the ceiling below the cupboard opened up at the moment so it is a good opportunity to do run the cabling so that it doesn't have to be surface mounted when I have the cylinder...

The boiler is filling up the unvented cylinder with hot water as it should but the hot taps and showers have increased in pressure and only release cold water (maybe a dash of hot water blended in). Intriguingly, when a particular hot tap that is near to the tank is opened (I haven't tested yet...

Hi, I'm planning to install a thermal buffer store (to prevent my combi cycling) as part of my UFH on a building control ticket. I'm a professional engineer, and feel competent to install it safely. However, I am unclear about part of the G3 requirements (so competency not quite there, but...

Hi all. We are having trouble with water pressure from our unvented hot water cylinder tank (a.k.a megaflo/megaflow). Over time, the pressure has reduced so much that we can't get any decent flow rate from the taps in the loft. Ground floor and first floor are very powerful as you can see on the...

Hi - I have a situation where the hot water pressure in the shower reduces significantly when I turn on a hot basin tap, but not when I turn on a cold basin tap. This is strange because there is a 28mm pipe from mains (~3bar) up to the attic where unvented is. It splits in 2 22mm pipes right...

Ok here goes…..I moved into a house in January which has got a lovely new bathroom and nice thermostatic shower. The setup is a traditional vented system with a header tank in the loft and hot water cylinder in a cupboard in a bedroom. There is a pump in this cupboard that powers the shower to...

Hi, I am new to the forum, I have a query about the megaflo eco plus unvented indirect cylinder, if anyone could advise me. My mains is 32mm and I think I have a flow rate of around 30l/min (whilst my mains are 32mm, all my house pipes are 15mm which will be replaced when the system is...

At the outset let me say that I am not looking for self help advice: this is clearly a job for a professional. I have a 250L OSO 20RD unvented cylinder. It has been installed for 15 years. It serves two Bristan thermostatic showers which recently have started to run cold. There is no pressure...

Hello, I have a Combi Boiler (Vaillant Ecotec Plus 428) and an Unvented Cylinder (Vaillant uniSTOR VIH GB 180s). Since yesterday we have no more hot water in the house, it comes out cold or luke warm. But the heating works fine. When a hot water tap is fully opened, the boiler reads S.30 (no...