Hot water cylinder size

[malc]

Hi all, I have a customer who is complaining of not having enough hot water.
Its a father and 19 year old son, 2 bed cottage, 1 bath, 1 basin, 1 kitchen sink.
The old cylinder is 450 x 900 indirect, although there is no boiler in the cottage, there are pipes connected to the coil which seem to run upstairs, but as i say no boiler, no rads ?
he currently heats water via immersion and was asking for bigger cylinder, for more hot water as at the moment its not really enough for one bath.
my suggestion was for a new 450 x 900 direct cylinder, with 27" immersion, but keep getting conflicting answers from suppliers on whether this will give customer enough hot water.
am i right ? or should i go for bigger cylinder ?
look forward to any answers thanks, malcolm.

 

[Best]

You could go for a cylinder with two immersions on the side. That way they will have choice of quantity and speed.
I keep saying it on here, but the Willis external immersion heater has been used for decades here and gives near instant very hot water and at any quantity you require - entire cylinder if you leave it to heat long enough

 

[Howsie]

Combi.

 

[Best]

I have just reread the post. You say there is "two pipes from a coil to upstairs". As it is a cottage, is there a back boiler for an open fire, or stove, or range? Sometimes this can be direct (no coil) to cylinder, or to a coil with a f&e tank.
Another issue in such a set up in a bungalow is the heat in the hot cylinder will reverse circulate over to the boiler, if one exists there. Need to check where those go to

 

[Whyme]

like best said probably an old vent and feed from a solid back boiler or old gas circulator like a carena e type. the answers budget dependent really. can they spend or are they a bit strapped ?

 

[malc]

thanks for replies, just looking for the simplest way to give them more hot water, not trying to find the cheapest way, but also don`t need to spend a fortune, which is why I thought a new 450 x 900 cylinder and 27" immersion would be the answer.