Any downsides to a 400/500 vs 300 uvc?

[indus]

Hi

I'm in the process of having my heating system upgraded. I need to choose an indirect uvc and my plumber thinks a 300l is fine. As I have 4 shower rooms I wouldn't mind over speccing a little.

So apart from the initial purchase cost are there any down sides to me choosing a 400 litre indirect uvented cylinder as compared to a 300 litre one?

Many thanks

 

[Plumber90]

Is the floor that the cylinder will be stood on strong enough to take the weight of a 400 litre cylinder???

 

[indus]

Is the floor that the cylinder will be stood on strong enough to take the weight of a 400 litre cylinder???

Yes

 

[dcawkwell]

Go for a tank from acv. Tank in a tank they have amazing reheat times only limited by how fast you can supply the heat. You can therefore have a smaller tank provided the boiler can keep up.

 

[indus]

Thanks for the suggestion but I don't think my plumber is familiar with them and so I don't want to complicate things at this stage of the works.

Also it sounds like a Thermal store and I'm removing one of those to have the unvented fitted.

May I ask what you feel about the 400 vs 300 uvc? Would the former have significantly slower reheat times?

 

[dcawkwell]

Thanks for the suggestion but I don't think my plumber is familiar with them and so I don't want to complicate things at this stage of the works.

Also it sounds like a Thermal store and I'm removing one of those to have the unvented fitted.

May I ask what you feel about the 400 vs 300 uvc? Would the former have significantly slower reheat times?

4 showers each taking 10 litres a minute for 10 mnutes
requires about 400 litres of water. About 2/3 of which is hot so 300 litres should do it. acv tank is just tank within a tank it gives a much bigger surface area therfore heats much quicker.

 

[indus]

Thanks.

Actually I can't see more than two showers running at the same time. However one might be a higher flow drench/cascade type but we'll probably end up with the same total demand that you mentioned.

Out of curiousity though, what would be the downside of over speccing and getting a 400l cylinder?