How are you measuring the water pressures of 0.75 and 0.6 bar?Hi,
We are renting and have a electric shower downstairs (extension) - a 9.5kW Triton T80Z fast-fit electric shower as well as a combi boiler Viessmann Vitodens 100-W B1KC 35 kW. Upstairs is a standard shower/bath direct from boiler.
Our family members tend to use the downstairs electric shower and have been recently complaining about the water pressure. We are well aware that if any water outlet is being used in combination then there is a drop in pressure at both ends - for whatever reason. This has occurred at times when only the shower is being used though. I performed a approximate water pressure test using a 1L jug and a time of 6 seconds, results where when the electric shower heating element is essential off not operational i.e. cold then the pressure is 7.5L/min @ 0.75 bar. When at a reasonable temperature it is 6L/min @ 0.6 bar.
The electric shower is rated for 8L/min @ 1 bar. So I guess we are slight off?
The main query is whether there is anything that can be done to increase the water pressure, I read that due to having a combi boiler a water pump isn't possible, hence the electric shower route I'm assuming?
Also would an upgrade to the 10.5kW version with everything as is just a swap out make any difference as it's rated with a higher flow rate? I am aware that a new electric cable may need to be fed depending on the current setup however if there would be no improvement due to being bottle necked by the water pressure there wouldn't be a point.
Appreciate any help/advice.
a flow rate of 6 litres per minute should be enough for a shower. Are your family members used to a high rate of flow from a power shower in a previous property?
I have a TZ80 10.5 kw shower in 2nd floor bathroom. Just used it and measured clip flow rate. I get 1 litre in 10 sec, 6litre a minute. we find that fine. Not measured flow rate when hot. Electrical Power is on the lowest of the two settings. I suspect could increase rate of flow by opening the main stop tap more … it’s not fully opened, but I’m happy with the flow rate.