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Sounds as though you have an airlock.
Is your hot water from a cylinder rather than a combo boiler?
Have you had plumbing work done/pipes drained? How long has it been going on?
Sometimes you can clear the airlock by covering the end of the kitchen mixer tap and turning on the hot and cold - thus forces cold water at mains pressure back up the hot wTer pipes and eventually forces the air out into the cylinder.If you have a combi and no cylinder I'm stumped.
absurdbird-
No, it's a combi boiler. It's been doing this for a while, but like I said there was plenty of flow before as long I turned the bathroom tap on at the same time. It's become especially bad this week after I topped up the pressure in the boiler though.
Also the boiler's about a meter from the kitchen sink which you'd think would mean there'd be enough pressure!
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Sometimes you can clear the airlock by covering the end of the kitchen mixer tap
Ugh - I'd almost forgotten the useless plumbing I had at a place i used to live - I ended up during rigging a pipe (with an oldmpiece of hose, some spare copper tubes and some compression joints) joining the hot & cold pipes that I could swap out with the flexi hoses and clear the airlock in the hot water system every time it went wrong.
frankenbike
NotThamesWater
More plumbing problems, let's see if anyone can crack this puzzle.
The hot water tap in my kitchen sink doesn't work; when you open the tap, nothing happens initially. If you leave it open for a few minutes, it will eventually start to drip/trickle. Meanwhile the cold works fine.
The interesting thing is that if I open the kitchen hot tap and then open a hot tap in the bathroom (bath or sink), water will start to flow in the kitchen. If I then turn off the bathroom tap again, the flow out of the kitchen sink will increase slightly. So my method for washing up was to open the kitchen tap, and then go and open a tap in the bathroom all the way and close it again, by which point there would be enough hot water flowing to do the washing up or whatever.
However, I was bleeding the radiators the other week which dropped the pressure in the hot water loop thing down to 1 bar, and so when I filled that back up to 2 bar, the flow in the kitchen tap was reduced so much that it's now unable to trigger the boiler/hot water. So I get a trickle of cold water instead.
If I want to do washing up I now have to either leave the hot tap in the bathroom running and fill the sink with a trickle of hot water, or boil the kettle twice and top it up with cold.
I am renting so if it's anything that I can't fix by prodding at taps/valves then I'll get the landlord to send the plumber round. But if it's only a 30 minute job I'm happy to do it myself so I can learn how to do it myself in case I need to in the future.
Anyone have any ideas what the problem might be? Hot water gremlin somewhere under the floorboards perhaps?