Narrowboat water system!

[hotshot]

I have just renewed the plumbing in my Narrowboat and the hot water only comes out in "spurts" with the pump "pulsing"the water through the Vaillant water heater.The cold water runs fine with the pump running continuous but hot water only trickles.The heater is firing up the same as the pulsing. I dissconnected the hot water pipe below the Mixer tap and it still only "pulsed"out. Does the accumulator have anything to do with pressure required to push the water through the water heater? The pressure upto the water heater seems fine but coming out of the heater is slow. The pump is a 30psi model.
Any idea anyone??

Thanks

hotshot.

 

[WDIK]

do you have a charge in the accumulator? is there a no return valve in the circuit?

 

[hotshot]

Hello WDIK
There is no charge in the accumulator and there is no non return vave in the system. There was no non return valve in the old system and it worked very well!

hotshot

 

[WDIK]

you need to drain off the system pressure and recharge the vessel

//www.diynot.com/forums/viewtopic.php?p=251090#251090

 

[hotshot]

Thanks,
Will try this over the weekend.