Seeking information on zoned gas ducted heating,I will be having 11 ducts.
Do you think the saving on running cost justifies the extra cost of unit,what brand would
recomend.Ducts will be in ceiling,single story.
Browse Forums Heating, Cooling & Insulation 1 Jun 21, 2011 6:55 pm Seeking information on zoned gas ducted heating,I will be having 11 ducts. Do you think the saving on running cost justifies the extra cost of unit,what brand would recomend.Ducts will be in ceiling,single story. Re: heating 2Jun 25, 2011 9:23 am I think this graph explains it: http://www.bonaire.com.au/gasheating/ducted/saving.aspx My current build will include a 3 star, I'm likely to upgrade to a 4 star *because* I get a programmable remote control. I don't like the on/off functionality of heating, I like more control lol Re: heating 4Jul 11, 2011 2:56 pm With only 11 ducts I doubt you'll need to zone your house. Zoning isn't the be all and end all. If you don't have a large space to heat/cool then you don't need to zone your HVAC. Remember that you will have to have a minimum amount of air pass through your heater. If you have too little air pass though the heater unit will get too hot and cut out. Subsequently your heater may be using the same amount of fuel and passing a similar amount of air to heat part of the house as the whole house. The company doing my HVAC advised me against zoning a 23sq (living area)house because if there was a need to cool the house at once the unit would either run out of puff or it would freeze up due to not enough air passing over the coil when only cooling the proposed common zone + 1 other. Re: heating 5Jul 11, 2011 3:03 pm Thanks for that chrisandkate,I am having evap cooling would that be same. My builder said same,not worth extra money Re: heating 6Jul 11, 2011 3:06 pm chrisandkate With only 11 ducts I doubt you'll need to zone your house. Zoning isn't the be all and end all. If you don't have a large space to heat/cool then you don't need to zone your HVAC. Remember that you will have to have a minimum amount of air pass through your heater. If you have too little air pass though the heater unit will get too hot and cut out. Subsequently your heater may be using the same amount of fuel and passing a similar amount of air to heat part of the house as the whole house. The company doing my HVAC advised me against zoning a 23sq (living area)house because if there was a need to cool the house at once the unit would either run out of puff or it would freeze up due to not enough air passing over the coil when only cooling the proposed common zone + 1 other. I thin zoning is always good to have. Its the only real way to cut down running costs. In a house like yours maybe you will have one zone for bedrooms and the other for living. In modern gas heaters you can have the fan speed and the coil temp reduce if you want to reduce the capacity of the unit. It will make a big difference in you heating bill. Also you don't necessarily have to spend more on the heater unit to have zoning-depending on what your having otherwise to begin with. Also builders are not that savvy about the details. Re: heating 10Jul 16, 2011 9:04 pm chrisandkate With only 11 ducts I doubt you'll need to zone your house. Zoning isn't the be all and end all. If you don't have a large space to heat/cool then you don't need to zone your HVAC. Remember that you will have to have a minimum amount of air pass through your heater. If you have too little air pass though the heater unit will get too hot and cut out. Subsequently your heater may be using the same amount of fuel and passing a similar amount of air to heat part of the house as the whole house. The company doing my HVAC advised me against zoning a 23sq (living area)house because if there was a need to cool the house at once the unit would either run out of puff or it would freeze up due to not enough air passing over the coil when only cooling the proposed common zone + 1 other. Your right that zoning isn't all it is made out to be. The main cost saving is by being able to installer a smaller (hence more 'fuel' efficient) unit than would otherwise be required. Would have thought though that 11 outlets would be about the size where zoning would start to make sense. For example it could be zoned into 2x 7 outlet zones (normally some outlets are in a shared zone, thus the counting discrepancy), and run from a unit with an output of around 20kw. If zoning wasn't used then for 11 outlets a 20kw would struggle so you would be looking at using a 30kw heater which is clearly going to cost more to run. Re: heating 12Jul 16, 2011 9:42 pm AJW chrisandkate With only 11 ducts I doubt you'll need to zone your house. Zoning isn't the be all and end all. If you don't have a large space to heat/cool then you don't need to zone your HVAC. Remember that you will have to have a minimum amount of air pass through your heater. If you have too little air pass though the heater unit will get too hot and cut out. Subsequently your heater may be using the same amount of fuel and passing a similar amount of air to heat part of the house as the whole house. The company doing my HVAC advised me against zoning a 23sq (living area)house because if there was a need to cool the house at once the unit would either run out of puff or it would freeze up due to not enough air passing over the coil when only cooling the proposed common zone + 1 other. Your right that zoning isn't all it is made out to be. The main cost saving is by being able to installer a smaller (hence more 'fuel' efficient) unit than would otherwise be required. Would have thought though that 11 outlets would be about the size where zoning would start to make sense. For example it could be zoned into 2x 7 outlet zones (normally some outlets are in a shared zone, thus the counting discrepancy), and run from a unit with an output of around 20kw. If zoning wasn't used then for 11 outlets a 20kw would struggle so you would be looking at using a 30kw heater which is clearly going to cost more to run. I am not sure you understand the benefits of how zoning works. Big systems can be as efficient as smaller systems. In your thought you are assuming that heaters run continuously all the time and don't turn off. A bigger capacity unit doesn't necessarily cost more to run. Effeciency has nothing to do with gas usage alone, but rather the ratio of gas required to produce a certain amount of heat energy. Re: heating 13Jul 16, 2011 9:54 pm B star,I am having a gas fire in tv room,and will run bedrooms for a few hrs in the night. living is where I would like to have heated most of the time,what would you recomend.Right about builders Re: heating 14Jul 16, 2011 10:32 pm I am not sure were in aus you are located, and whether or not you require furture upgrade for re fridge air cond. However you are looking for heating in gas and what the most flexible and energy effecient then brivis have the newely updated 5.8 start energy effecient heater. I have the old version which although you can adjust the fan speed and the furnace temp you cant have two different setup for the different zone. Ie i have fan set to max the set up. This is perfect for the livng area however if i have just bedrooms the fan speed is to fast. With the new systems if i select just bedrooms the fan will slow down. I also think the furnace will only turn on to 80% or something like that. Go for the system that can heat your whole house if possible. Also if you have a fireplace you can have these ducted heating just on fan only. this will enable you to suck air from one room (where the return air is located) and pump it into other rooms. Re: heating 15Jul 16, 2011 10:39 pm Thanks heaps,builder has quoted for a brivis not zoned said it would be ample for my house[I live 40mins north of melb]gets very cold in winter I am thinking future cost are only going to get dearer,that why I would like zoned Re: heating 17Jul 16, 2011 11:10 pm Thanks Bstar,will get info off builder,I feel a little wiser[I think] Re: heating 18Jul 19, 2011 7:03 pm Can someone tell me if I have to have my return vent in wall or can it go in ceiling.maybe you could have a look at my plan,the RA in passage way Does anyone have a suggestion for a good hydronic in slab heating speacialist who may be able to help me with an existing system and wether or not it may need a seperator… 0 4883 |