Shower, boiler , low pressure problems? i have basically got a shower fixed. i brought a mixer tap...

i have basically got a shower fixed. i brought a mixer tap and shower head , stand etc. when i switched it on the pressure be very low and the heat kept changing. highly hot to very cold. not mixed. Any course i could fix this . the man said yuo need to buy a pump. any other ways please.
Can you use them drive positive lights contained...
Answers:    Bad choice of shower for your situation, should own had an electric shower fitted.
It would still be easier and cost influential to fit an electric shower rather than fit a pump and associated plumbing alterations and electrics.
Kenmore or GE electric marine furnace? Which is...
If you inform us which boiler you have, and which shower you own bought, we may be able to abet. Sounds like you own a conventional system with tank, if the cold water container is not high ample, then you inevitability either a shower pump, or tilt the cold water reservoir so it has more pressure.