The pumps will not boost a combi boiler if you want a flow of 9.5 litres of hot water but if all you want is to boost and individual shower they will. A typical flow for a good shower is 6 litres of water from a typical shower head. Trying to force a flow of more that 6 litres a minute gives you a bit more sting but not much more flow.Hi, if I add one of these to a combi thats running at 9.5 ltr, what will they "boost' it to, I'm only interested in it for a shower.
To get a shower at say 42 deg C you need a mix of 2/3 hot mixed with 1/3 cold and a SPB if great at boosting 4 litres of water to a very decent pressure. At around 8 litres a minute they deactivate and give very little if any increase in pressure.