Hi, a bit of background first. I Have a Gloworm Ultimate Balanced Flue boiler. The heating part is pumped whilst the hot water is gravity fed. I’ve mentioned in other posts that the plumbing is a bit dire and that my intention is to stop using the boiler to provide hot water and use the immersion instead.
The above plan is in action. It is a bit of a pain having to remember to switch the immersion on to get a tank of hot water but it’s a small price as it takes about 20 minutes to get enough water to bath the kiddies – the gas used to just keep firing for as long as the system was on and even then, the water temperature was variable.
Last night, as the weather has turned slightly cooler, I put the “Heating and Hot Water” function on to twice. The room stat is set at about 16 degrees and the temperature within the house is about 22 degrees (the stat clicks at 22, anyhow). If my understanding is correct, this means that the stat is not calling for heat.
Despite the fact that the stat is set lower than the room temperature, the boiler is still firing as soon as the time switch kicks in. The pump doesn’t operate until the room stat is turned up. Is this normal?
I would have thought that the “Heating and Hot water” function would heat the central heating while the room stat is calling for heat. As a by-product, convection within the boiler would send hot water up the gravity flow and this would heat the hot water. Is my interpretation wrong of how a gravity system works?
The programmer is a Honeywell, BTW. It has no model number on it but it is digital and is about 4 inch square. It has a slider for “Heating and Hot Water” and one for “Hot Water only”
I don’t intend to use the gas boiler for hot water ever again unless I convert it to fully pumped. I don’t have the wiring diagram for the programmer but, is there any harm in taking the power supply for the boiler from the same feed as the power supply for the pump?
Any advice would be greatly received. It’s not a problem at the moment as we don’t need the heating on but, in winter, if we go away we tend to set the room stat fairly low just to keep the house aired. I don’t want to be heating a cylinder (poorly lagged at that) of hot water for the sheer fun of it.
Cheers
G
The above plan is in action. It is a bit of a pain having to remember to switch the immersion on to get a tank of hot water but it’s a small price as it takes about 20 minutes to get enough water to bath the kiddies – the gas used to just keep firing for as long as the system was on and even then, the water temperature was variable.
Last night, as the weather has turned slightly cooler, I put the “Heating and Hot Water” function on to twice. The room stat is set at about 16 degrees and the temperature within the house is about 22 degrees (the stat clicks at 22, anyhow). If my understanding is correct, this means that the stat is not calling for heat.
Despite the fact that the stat is set lower than the room temperature, the boiler is still firing as soon as the time switch kicks in. The pump doesn’t operate until the room stat is turned up. Is this normal?
I would have thought that the “Heating and Hot water” function would heat the central heating while the room stat is calling for heat. As a by-product, convection within the boiler would send hot water up the gravity flow and this would heat the hot water. Is my interpretation wrong of how a gravity system works?
The programmer is a Honeywell, BTW. It has no model number on it but it is digital and is about 4 inch square. It has a slider for “Heating and Hot Water” and one for “Hot Water only”
I don’t intend to use the gas boiler for hot water ever again unless I convert it to fully pumped. I don’t have the wiring diagram for the programmer but, is there any harm in taking the power supply for the boiler from the same feed as the power supply for the pump?
Any advice would be greatly received. It’s not a problem at the moment as we don’t need the heating on but, in winter, if we go away we tend to set the room stat fairly low just to keep the house aired. I don’t want to be heating a cylinder (poorly lagged at that) of hot water for the sheer fun of it.
Cheers
G