I need a control stem for a bernzomatic patio heater, model #PH3250S. Where can I get one? I bought it from a Home Depot in Brantford Ontario Canada and they don't carry any replacement parts. Bob

Bernzomatic does not provide nor sell replacement parts for their products - they consider them disposable.
If the plastic knob is the only piece you need, Amazon sells a few replacement knobs for patio heaters. I searched Amazon with the terms:
replacement knob patio heater

The blocks from 23 to 31, at Colonial CRES in Brantford, Ontario (ON) Province have a unique postal code
23 - 31 Colonial CRES, Brantford Area Code is 226/519 and Time Zone is Eastern (GMT -05:00).
Remember you have 2 kinds of blocks: even or odd. In this case you are matching Even and Odd numbers for this block

try Northern Tool + Equipment at NorthernTool.com. They have quite a few accessories available.

I found you now fu.cker

most universal kitchen, bbq,small appliance replacement knobs will fit ur application

what you could do is have like a lever valve (like the ones on garden hoses but for gas systems)
and then have the burner on full blast but you control the amount of gas going in

These regulators can usually be purchased from Canadian Tire or Home Depot. If you are unable to locate the exact replacement, email the model number located on the regulator and I will locate one for you. I am in the GTA and can be contacted via company website. www.emshvac.com
But one question, why do you think the regulator is defective? These rarely fail.

See my reply on this other post. http://www.fixya.com/support/t3536737-trying_ignite_heater_but_will

where you able to find parts, i am looking for a new regulator