Combi Boiler Poor Hot Water Flow Rate
Hot water is hot enough but the volume is disappointing, especially in the shower..
Hot water is hot enough but the volume is disappointing, especially in the shower.
What is actually going on
Hot water is hot enough but the volume is disappointing, especially in the shower.
The realistic causes, in order
Incoming mains flow rate that is genuinely lower than the boiler could deliver A scaled or restricted plate heat exchanger A blocked inlet filter or flow restrictor in the boiler's cold inlet
What we test on site
Mains flow rate measured at the stop tap and at the boiler Delivered hot flow at the outlet with temperature rise recorded Filter, restrictor and exchanger condition
Questions we get asked
What causes a combi with a poor flow rate on a gas boiler?
Incoming mains flow rate that is genuinely lower than the boiler could deliver
What normally puts a combi with a poor flow rate right?
We measure first and recommend second, so you're not sold an appliance your water supply can't feed.
Is it safe to keep using the system with a combi with a poor flow rate?
No combi can deliver more hot water than the incoming main supplies. Where mains flow is the limit, an honest answer is a cylinder-based option, not a bigger combi.