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After you changed tank and regulator did you notice any physical change in the pilot light, such as low flame,
or yellowish tip to the flame..
Pilot flame needs to be blue with no yellow tip, and must heat red hot the tip of thermocouple 1/2 at the top
Is that the case?
When you turn on main burner does the pilot flame stay the same and continues to heat properly the thermocouple, or is the pilot flame get pulled off the thermocouple
When heated right, The thermocouple produces up to 30 millivolts and keeps the gas valve open to supply gas, if not the pilot will shut itself off. thermocouple will eventually go bad and need to be replaced .
20 lbs and 100 lbs should have no impact, Are you saying that if you take 100lb tank off right now and put the 20 lbs on it will work? did you just try that.
Propane reg. are set to give 11 WC pressure,
please attach a picture of new reg.
use the paperclip logo just above.
OK please do that
OK that is a set pressure reg and can not be adjusted for pressure
It is possible the preset is not right to 11 wc. pressure
You should have your propane expert mesure output pressure, and bring your heater with you.
It is my extensive experience with those heaters to say that out of box some are not OK and have issues.
Plus that heater does not exhaust outside and produce carbon dioxide and will eventually produce carbon monoxide, (poisonous and very harmful) they should only be used as a temporary measure in a well ventilated space.
100lbs is the same as 20 lb, your heater uses the vapor space and does not have a tube in the middle. tank is filled at 80% liquid propane and 20% at the top supplies vapor propane for your heater, a 20 lb will lose pressure quicker because of less vapour space so that is irrelevant.
I have 25 years experience as propane technician and confirm 100% what I am saying.