Add megaflow/ariston and remove normal hot water cylinder

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7 Jan 2010
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Bedfordshire
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hi guys

we are about to buy a house that has an oil fired heating system and two hot water cyliders one of which provides an annexe which is part of the main house, i want to remove the tanks from the attic and remove the two old style hot water tanks and replace them with one 250l megaflow/ariston.

is this a job that can be done?

thanks in advance.

Chris
 
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Yes it is a job that can be done.

You will need to check the flow and pressure of your incoming water main.

a benchmark is 20 litres per minute and 1 bar pressure minimum, although the greater the better.

And you also need to have the unvented cylinder installed by a competent person that holds a current G3 unvented ticket.

Graham
 
Easily achievable by a competent installer. Wouldn't have a Megaflo out of choice though, and certainly wouldn't have an Ariston UV cylinder. Megaflo cylinders are the better of the two but are expensive and the bubble-top design simply doesn't work, sooner or later it's going to disappear and need recharging which is just a bit of a pain in the ass. They're also physically much taller due to that bubble top in the cylinder. Aristons are comparatively very slow to heat up from cold and also to recover after a draw-off.

Your installer will have their preference no doubt but I don't think you should be looking any further than an OSO Super S, they're fantastically well designed, easy to install, very well insulated and heat up very quickly too - a 250L can be heated from cold in 27 minutes and will recover to full temperature after a draw-off of 70% capacity in 19 minutes. By comparison the Ariston takes 33 minutes to recover from a 70% draw-off, they don't quote a heat-up time from cold but the maths suggest somewhere around 48 minutes. Megaflo cylinders fall somewhere in the middle at 24 minutes to recover. Of course, heat-up times aren't everything but they're a reasonably important consideration for consumers who want the best performance
 
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