Combi Boiler and Shower Problem - Shower Alternates Between Gushing and Trickle? Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[southlondoner]

We took out the water tank in our fourth floor flat and replaced the system with a new combi boiler and installed a shower. The shower alternates between gushing and trickling, the water temperature between freezing and boiling hot. Is the only way around this to install a cold water tank to help with the feed to the shower? It's almost unusable as it stands.