Hi. I am replacing a Teledyne heater for a in ground pool. The heater is indoors and is vented to the outside. I'm looking at the LRZ400EN. I understand this has the electronic ignition and not the mili volt I have now. I will have an electrician wire it. My question is about the venting and if I need a draft hood. I know I need to vent it to the outside. I had hoped to just connect to the venting that's there now. Do I need the draft hoot to be able to attach the venting to the heater?