Ok to change price right before contract?

[Marci Stein]

So my house was listed at 219 k, and I agreed to sell at 205 , as is. 
called plumber to turn on heat and hot water for inspection , but the heat did not come on (after I paid him $1000 )

I would like to charge the buyer $1000 more . I now have to buy a new hot water heater.  contracts were sent to lawyers, but not yet signed. 

Has anyone ever done this ? not sure it is the right thing to do and if I lose this buyer, I am not concerned I will charge more for the next one. But the realtor, a friend will be upset.  
thx very much .

[Chris Seveney]

@Marci Stein

Good luck with that. Did you list the house saying it did not work? If not, then the buyer would have expected it to work.

While a new one is more valuable than an existing, you will be splitting hairs of maybe $500 on a $200,000 purchase and if they walk your carrying costs per month are most likely more than that.

You can always try but typically repairs like this are by the seller

As a buyer I would say no.