tankless hot water and manabloc

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by johnporta1, Jul 23, 2010.

  1. johnporta1

    johnporta1 New Member

    Messages:
    1
    Location:
    fl
    I have installed a 36 port manabloc with a on demand hot water supply. It is currently supplying 2 sinks a toilet and shower. The sinks work fine but the shower will not turn on the hot water unit. When I reduce the pressure on the cold side of the manablock the hot water unit comes on but the temp of the shower fluxuates and the cold supply is very low.
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,313
    Location:
    New England
    Tankless systems require some minimum flow before they will fire. In FL, your 'cold' water could be quite warm this time of the year, and your actual hot requirements may not be large enough to trigger the unit to come on. Not sure if there's anything you can do about that other than wasting some water by adding a second or higher flow showerhead. If you adjust the shower temperature to full hot, does the tankless trigger? How cold can you get it and still have it continue to fire?
Similar Threads: tankless water
Forum Title Date
Plumbing Forum, Professional & DIY Advice Nortiz tankless water heater - water not hot enough Nov 14, 2014
Plumbing Forum, Professional & DIY Advice Two 50 gallon LP or one 199K tankless LP water heaters? Aug 14, 2013
Plumbing Forum, Professional & DIY Advice Any way to have a gravity recirc loop with a tankless water heater? Jul 4, 2012
Plumbing Forum, Professional & DIY Advice How to add tankless water condensate drain and softer drain to existing plumbing? Apr 5, 2012
Plumbing Forum, Professional & DIY Advice Tankless water heater, recirculation pump? Mar 25, 2012

Share This Page