unvented

Having an extension built, getting underfloor heating through extension and adjoining existing room, and our boiler has definitely seen better days. ...so getting the boiler replaced at the same time seems like a no-brainer. So far, so straightforward. But a friend recently recommended I get...

I have a vented S Plan with a System Boiler stacked over the DHW Cylinder in a tight airing cupboard. The Cylinder is 1150 High and over it is a Vaillant Boiler. All is working perfectly with flow to a first floor shower just acceptable and we have plenty of stored hot water. But we are about to...

Hi all, Moved into a property earlier this year and noticed a really strong vibrating sound coming from the cylinder room on the top floor. It happens for maybe 4-5 seconds in the morning when we're drawing hot water for the first time. Usually notice it when one of us has a shower in the...

Hi, I'm hoping from some sage advice, from you lovely people. I have a Valiant Ecotherm 832 Combi boiler that was put in about 4 years ago. I'd just moved in, and the place had an old oil boiler that sounded like a jet engine, and an uninsulated hot water tank that was taking up tons of room...

Hi I wonder if anybody can enlighten me to what my problem may be. I have recently drained the CH and filled it back up, bleeding all the radiators. The system has an unvented cylinder with two zone valves. When the valves are fully open there is hardly any noise from the cylinder and the...

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...

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...

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...

Hi I have pressure of 1.5bar about 14L/min flow rate with 2 thermostatic showers and so was thinking Ill get a a combi that heats about 14L/min. Worst case is Ill get 2 showers 7L/min which is okayish. However someone suggested unvented cylinder if 2 showers but how will this give me more L/min...

Hello, I’ve bought a Vitodens WB1B316 Compact Heat Only Boiler, part no. 7416307, for use on an sealed system, replacing a 17 years old Baxi Potterton Promax 24HE. I'm trying to understand what do I need to get exactly for the Vitodens to work in a sealed system, as I'm supplying all the parts...

I'm about to start the process of replacing my vented hot water tank with an unvented cylinder. Currently, I have a power shower installed (Aqualisa Aquastream). I've been told that I can't use that with an unvented cylinder. Would I be able to keep using it for a while if I simply unplug the...

Hi. Over the past couple of months the hot water system in my house has started making an incredibly loud reverberation when a hot water tap is opened. I would liken it to the sound of a ruler being twanged on a desk. It is very loud and fades to silence over a period of about 3 or 4 seconds...

Hi all. I've just signed up and found this forum useful, but having searched exhaustively, I could not find this info. Q. Can I pump just hot water (single impeller pump) and not pump the cold water from the cold water storage tank? Or use two separate pumps? I ask because most of the water...

Hi all, looking for some advice. we have an unvented cylinder in our house. but our mains what supply isn't great. 3 bar static pressure with 14l a minute. we have changed the supply pipe from the old lead pipe to a 25 mdpe pipe and there was no improvement. the water board have confirm that...

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...

I am considering having my vented hot water cylinder upgraded to an unvented cylinder. Therefore, I will also need to have our power shower replaced with a mixer shower. However, I only wish to do this if the shower performance is going to be the same or better. How do I ensure this will be...

Hi everyone Currently undergoing a loft conversion and my plumber has recommended to get an unvented cylinder installed, I like the idea of it but forgot to ask the plumber will this work with a combi boiler? Is it a simple job or will the boiler need changing? I've got a Baxi Duo Tec 33kw...

Hi All, I'm renovating a small 3 bedroom semi in Norwich. We're planning a large extension (2 storey side, loft and single storey rear) to essentially provide 4 double bedrooms along with complete renewal of the existing house. The current central heating system comprises a gas combi boiler...

HI all, I am currently in the process of having a loft conversion done, of which I am planning to upgrade/change the heating and hot water system as the house will be a 5bedroom with 3 toilets once complete. I currently have a condensor boiler which is 24kw, which has the usual cold water and...

any one know where I might be able to get hold of an installation manual for the above. We at one of these in a basement and the previous owners took all manuals and wireless stats with them??? Got some issues we'd like to check up with the D1! Cheers if anyone can help would be very grateful...