bacon_sandwich
Gas Engineer
The safety valve aka pressure relief valve appears to be there (red thing) but if it does in fact relieve itself it will discharge water directly into your house roughly south of the red valve. It is supposed to discharge water outside (in a safe manner, i.e. so not to scold anyone ), also there is supposed to be a device below the red thing so you can visually check for evidence of discharge. Your property is currently at risk from water damage as is.