Heatrae Sadia Streamline

[joegina]

We have been advised to get one of these for a conversion we are doing. It will do the kitchen sink and a toilet wash hand basin. My question is do we go for the 7 or 10 litre version? and do we choose the 1 or 3kw one?
Thanks, Johnny

[coccinelle]

It all depends on how much water you use ie how many people wash their hands in the basin, if you wash up... I have a 10l one but quite honestly a 7l one would have done as I have a dishwasher.

[buildersmate]

The 10l one stores more hot water (obviously). This means more hand washes before the system runs cool.
The 3kW one takes less time to reheat once the water is run dry (again obviously). A typical kettle is rated close to 3kW but only heats maybe 1.5l of water (and you know how long one of those takes to heat up). So a 3kW heater on a 10l capacity boiler is going to take perhaps 10 minutes to reheat (a rough estimate). A 1kW heater on the same boiler is going to take 3x longer - say 30 minutes.
Work out what best suits your needs from there.
Frankly if the purchase price isn't much different, I'd go for 10l and 3kW - the installation price (the major element) is going to be the same

[joegina]

very helpful, thanks.