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Yes you are right that the quoted heat up and recovery times are based on a flow temperature of 82 deg. The times are also based on a flow rate of 0.25lt/s which would equate to a velocity of 2.6m/s in my super duper pipe. If I remember rightly I read a post from yourself on another thread that...

The 'installer' has been called back and will be again. I've told him what I thought the problem was, he disagreed. I came to seek a bit of advice before telling him to correct it. If he refuses then he won't get his nuts. Simples. Its not a huge job to correct it, maybe 15m of pipework has...

Thanks for all your replies, they are appreciated. I'll try to answer your questions, D_Hailsham The problem just seems to be there all the time. If I switch the heating on then the flow temperature to the coil drops initially but does come back up once the heating circuit warms up. I...

It's not switching on and off. It's just running constantly at minimum output level, it's throttled/modulated back as far as it can. There are two valves on the flow and return pipes but they are open. Not sure what you call them but I think they are there so you can isolate the cylinder...

I've tried force the speed to maximum. It seems to have made a bit if a difference as the boiler throttles up to a higher output initially. It's nowhere near maximum though that's for sure - gauged purely on noise! The pipe run is about 6m horizontally and 3m vertically from boiler to...

The temps have only been measured by hand so not very scientific. Next to the cylinder the flow pipe is piping hot and the return pipe temp varies from very cool when the tank is cold to hot when it's heated up. Wouldn't say the return is getting as hot as the flow but whether it 10 deg or 20...

The temperature is set to 70-75 deg. This may be below the optimum but this was the setting used previosuly. By minimum setting I mean its always running at its lowest output level, 5kW I think. The coil is rated at 20kW. Norm

Hi, I've just had a new central heating system installed and the recovery/heat up time for the water is very very slow. My old system was a vented one and when the water was boosted the boiler would throttle up and run at maximum for a period of time (maybe 10 mins depending on the initial...