Allowing the faucet to be open will prevent this pressure from building up and thus, keep the pipe from bursting.If you are leaving on a trip, do not turn your heat completely as this can cause pipes to freezeThe heat does not have to be kept as high as you normally would keep it if you were actually in the property, but keeping it set above 50 degrees Fahrenheit is a good idea.

All PVC pipe and fittings have a max operating temp of 140 degrees Fahrenheit.

But I adhere to NYC heating laws since they are more favorable to renters.)I have coin-operated laundry in the basement that is accessable via an outside door.What I want to accomplishAllow tenants SOME control over heatBetween the hours of 6:00am and 10:00pm, if the outside temperature falls below 55 degrees, the inside temperature is required to be at least 68 degrees Fahrenheit.

The temperatures of these arcs can exceed 10,000 degrees Fahrenheit.

The temperature gets to 72 Fahrenheit on the hottest day here in the south GA when temperature outside is about 100 degrees. 

Salt as a melter only works down to zero degrees Fahrenheit, and with vastly diminishing results at 5-10 degrees.

But the thermostat was no where near my unit, so it would come on only when the temperature outside was lower than 60 or so degrees Fahrenheit. 

The heat had to always be at least 68 degrees Fahrenheit half the year or tenants would call 311 and get me fined (gas to keep the house warm cost me $850/month because of the poor insulation).

The temp can get below 0 degrees Fahrenheit here in Kansas.  

Tenant acknowledges that Landlord, orhis agent, upon commencement of tenancy has or caused the hot water heater tobe set at a temperature of not higher than 120° Fahrenheit (or 49° Celsius).