Sometimewoodworker wrote:Roger Ramjet wrote:Sometimewoodworker wrote:The other point is that usually stored hot water systems are not pressurised. They have their own stop valve and a pressure relief system so that the hot water can expand. However if yours is pressurised then the hot water pressure will fluctuate in line with the cold so again there would not be any change in temperature.
I was told, because there is no relief valve in sight that the Eltron is pressurised and has electronic safety cut-off inbuilt. It can be adjusted for temperature required by taking down the bottom plate. I think it's a PSH100-SI. I'd have to look at the manual to be sure. I bought it because it said it conformed to all EU standards of safety. It's also very cheap to run and requires only 1 mm wiring.
The reason I bought the Mitsubishi pump was to service the whole house, pool and garden. For what it's worth its done the job well. I also needed a lift pump because it is mounted on the wall two metres above ground level.
But, I am no pump expert, or hot water heater expert, so I just went with what was recommended.
Now I'm totally confused. The picture you showed in your build is a Hitachi WT-P400GX. Did you change that one.
However for information for others both the shallow well pumps and the constant pressure pumps can be mounted above the level of the water supply. The shallow well pumps (Mitsubishi WP and Hitachi WT) can suck from about a maximum of 7 to 8 metres and pump to about 20 metres. The constant pressure pumps lift from 6 to 8 meters and pump to about 18 metres.
arranp wrote:to help my understanding, the WT-P400GX gives "suction lift" as 8m and "discharge head" 20m. Does this mean the pump can be no higher than 8m above the base of the water tank, and will pump water to max of 20m from the pump, and the water will come out of the shower at 56 litres per minute given sufficiently large pipe for example 35mm. ? and it consmes 400 watts of electric per hour.
shower head level - 52 litres of water per minute
( 20m )
( 8m )
water tank level
arranp wrote:i see it.
any idea how to work out the discharge capacity 20m above the pump?
clearly you didn't because the figures are in my posted pictures.arranp wrote:igot it i did read the manual hence the question.
Sometimewoodworker wrote:Welcome Mikos
My opinion, and the way we will build, is that the well pump should feed at least 1 tank at a high enough elevation to supply water when the power is off. In our village this happens almost every time it rains and there are power cuts of up to 4 hours at other random times.
Some will claim that a pressure tank will be enough and if you have a good power supply it may be, we don't so for us it isn't.
Our plan is to have a small, 500 litre may be, tank just under the roof. This should be enough to feed the toilets and washing up water it may even provide a low power shower on the ground floor. We are going to look into a low voltage solar powered water pump to help the pressure.
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