Combi Boiler Hot Water Flow Rate

Suppose we want a hot water flow rate of say 9 litres per minute from a combi boiler or instantaneous.

Combi boiler hot water flow rate.

In most cases this is really referring to how much water can flow through the boiler how fast it can come out of a tap or shower head once the boiler is working. Thus with a boiler rated at 54 kw it can provide a hot water flow rate of 25 litres per minute. Choosing a powerful combi boiler with a good flow rate will help you to optimise hot water pressure around your home. Essentially this determines how much hot water your boiler can send to your taps or showers.

When manufacturers installers talk about water heaters especially combi boilers a key phrase used is flow rate. Hot water flow rates on combi boilers can vary from 9 8lpm to 25lpm. So you can have a 32kw boiler that can give you 13 litres per minute. Our tables below show hot water flow rates in the right hand column.

Ideally the combi boiler flow rate for a good shower should be at least 12 15 litres a minute. The pump in the shift cylinder is to circulate stored hot water not to deliver it. Two weeks ago the hot water flow rate at all taps from my combi boiler worcester bosch 24cdi dropped from it s usual 9l min to less than 4l min. This will on average provide nine litres of hot water at a temperature of 35 degrees every minute.

Suspecting the boiler i called worcester bosch for one of their fixed price call outs. So let s take an average combi output of 24kw. This is usually measured in litres per minute l min and equates to the volume of water coming from your plumbing fixtures. Whilst having optimum hot water flow rate from your combi boiler adds great benefits such as increased thermostatic or mixer only shower performance decreased wait times to fill your bath tub.

The hot water flow rate expressed as litres per minute lpm indicates the speed at which the boiler can heat water supplied to the hot water outlets taps showers etc. If so a combi like a valliant 938 with a shift load cylinder valliant s term not mine will only deliver hot water at the incoming flow rate. We always recommend water flow rates to be tested first with a weir water flow cup to ensure you have sufficient flow rate incoming from your mains supply. Today manufacturers make an array of different outputs.

This is another calculation on heating water this time relating hot water flow rates and boiler power. However this size of combi boiler will heat the home but can only heat 9 5 litres of water per minute. The enigineer came and replaced the water water heat exchanger diverter valve and pressure relief valve. The higher the output of the boiler the higher the water flow rate.

Fit a larger output combi with a high flow rate. The shift cylinder if so configured holds around 1 minutes worth of hot water at a delta t of 35 degrees. Your hot water takes much longer to reach the tap. It too ends with a handy rule which can be applied without reference to a manufacturer s manual.