What type of system do I have?

[mayonline]

Hi, I've recently moved home and would like to identify what type of system I have installed please. I've att'd a few photos. Please could someone help with this? I don't thinks it’s a combi, but may be wrong. There is no expansion tank in the loft
thank you !

 

[Best]

That Megaflo is a hot water cylinder that is stainless steel unvented and therefore allows you storage of hot water, unlike a solely combi gas boiler system. It has same benefits that a combi system has (balanced high pressure to hot and cold throughout the house) but better flow rates of hot water due to heated water already in storage.
Note you need to have that unit serviced once a year by an unvented qualified plumber to keep it functioning well and for safety as well as manufacturers warranty of cylinder, often 25yrs.
That unit has an air bubble that allows expansion and this depletes which is something you can correct yourself on occasions.
To heat that cylinder from cold will usually require a couple hours on programmer to be sure to fully heat it. It is thermostatically controlled, so your gas boiler will shut off once the Megaflo reached temperature.
Your gas boiler is perhaps a sealed system boiler, same as a combi, only without the hot water and would require the system pressure (that is rads and gas boiler) to be kept in pressure - usually more than 1bar, so check boiler instructions on pressure & how to top it up at boiler

 

[mayonline]

That Megaflo is a hot water cylinder that is stainless steel unvented and therefore allows you storage of hot water, unlike a solely combi gas boiler system. It has same benefits that a combi system has (balanced high pressure to hot and cold throughout the house) but better flow rates of hot water due to heated water already in storage.
Note you need to have that unit serviced once a year by an unvented qualified plumber to keep it functioning well and for safety as well as manufacturers warranty of cylinder, often 25yrs.
That unit has an air bubble that allows expansion and this depletes which is something you can correct yourself on occasions.
To heat that cylinder from cold will usually require a couple hours on programmer to be sure to fully heat it. It is thermostatically controlled, so your gas boiler will shut off once the Megaflo reached temperature.
Your gas boiler is perhaps a sealed system boiler, same as a combi, only without the hot water and would require the system pressure (that is rads and gas boiler) to be kept in pressure - usually more than 1bar, so check boiler instructions on pressure & how to top it up at boiler

Thanks for the response.

When you say I need to get the "unit" serviced annually, by unit, do you mean the boiler, or the hot water cylinder or both?

Also, if I needed to describe what system I have to a plumber in order to get a quote for some work, what would I say? An "unvented megaflo system" or a "Sealed system" maybe? I think you are saying that it isn't a combi right?

For info, the boiler is being replaced in Aug, when we have our kitchen refurbed. We have a four bedroom house, soon to be five, which has two bathrooms (one with bath and shower and the other with just a shower). I'm just trying to get my head around what I should replace it with. Any advice appreciated, and please excuse my ignorance!

Appreciated!

 

[Best]

You have an unvented hot and cold water system.
Your heating system is a sealed system (as it has no small feed tank in attic to fill it).
The Megaflo cylinder will be ideal for you as it gives better flow rates of hot water than a combi boiler would. Perfect for larger homes with 2 or more bathrooms.
It might seem confusing, but an option when choosing a new gas boiler but still keeping the Megaflo hot cylinder would be to either have a system gas boiler (“system” means it encompasses all the sealed system parts, expansion vessel, circulating pump etc), or a combi version piped same and heating Megaflo etc, but use the hot water from new boiler for some of the taps or nearby outlets. But your gas installer will know best.
Servicing of gas boilers and Megaflo is once a year and likely better for convenience and cost that the gas service person does both in one visit

 

[mayonline]

You have an unvented hot and cold water system.
Your heating system is a sealed system (as it has no small feed tank in attic to fill it).
The Megaflo cylinder will be ideal for you as it gives better flow rates of hot water than a combi boiler would. Perfect for larger homes with 2 or more bathrooms.
It might seem confusing, but an option when choosing a new gas boiler but still keeping the Megaflo hot cylinder would be to either have a system gas boiler (“system” means it encompasses all the sealed system parts, expansion vessel, circulating pump etc), or a combi version piped same and heating Megaflo etc, but use the hot water from new boiler for some of the taps or nearby outlets. But your gas installer will know best.
Servicing of gas boilers and Megaflo is once a year and likely better for convenience and cost that the gas service person does both in one visit

Thanks again. Final question....I promise. See pic. My understanding is that the device shown reduces our water pressure as maybe we are in a high pressure area. The reason I ask is that I need to replace a shower. The unit I am thinking of getting states "Suitable for High Pressure Water Systems Only".
Any advice available on that please?

 

[Deleted member 120897]

Yes, you have a pressure reducing valve, which by the looks of it reduces it to 3 bar pressure, which would answer your shower should be suitable for high pressure systems, afaik low pressure systems are that of gravity fed and very low mains pressure, typically less than 1bar pressure.

As for replacing the boiler as per @Best your installer will know best. You’d be better keeping the megaflow imo, combi’s suffer poor hot water delivery if more than one outlet in use, generally. You could opt for an intergas eco rf 30 as these are a multiple choice boiler (they can be setup for different scenarios), a system boiler or even a combi, but needs to be wired and plumbed correctly.

 

[mayonline]

Thank you very much for taking the time both of you.