boiler thermostat setting

ive recently had a new ideal isar he35 fitted, the user instructions say 'set the boiler thermostat to maximum and switch on' my question is what would be the most economical way to run this type of boiler? i presume on the maximum setting the boiler throws the heat out until the room thermostat switches it off, if however the boiler thermostat is set to a mid position would the boiler switch itself on and off until the room thermostat was satisfied? if this is correct which method would be most economical in terms of gas usage and boiler wear and tear

thanks in advance

andyd

Reply to
andyd
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This is a modulating, condensing boiler and will operate at its maximum efficiency at lower temperatures. However, if you are connecting it to an existing set of radiators which were designed for a conventional boiler temperature of 82 degrees, then in very cold weather, you may need to have the boiler running at this temperature.

The Isar boiler will automatically set its own temperature and gas burn rate to match the heat requirement for the house, while trying to run at the lowest temperature. Therefore it's reasonable to set the thermostat high and let it do its own thing.

.andy

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Reply to
Andy Hall

The most efficient is to set the boiler thermostat at the lowest setting consistent with also heating the house adequetely. You may find this requires it to be bumped up in particularly cold weather. Depending on the complexities of the heating control systems, the boiler may decide to turn the temperature down automatically for efficiency purposes.

This only applies to condensing combi boilers.

Non-combi boilers require hotter water to heat the hot water cylinder, so can't be run much below 70C in most cases. Non-condensing boilers will also be more efficient at low temperatures, but with the side effect that they might start condensing and rot away in a few months, so it is recommended to maintain high temperatures.

Christian.

Reply to
Christian McArdle

I forgot to say, that doing so also has a safety benefit. Traditional radiators had a peak temperature of 82C. Using the method above, in normal weather so that the dial can be right down, you may find 60C or even 50C to be acceptable, which is far less likely to scald a child.

Christian.

Reply to
Christian McArdle

Even at the maximum setting, it is still a thermostat and will switch off when the set - albeit high - temperature is reached. It *doesn't* become a permanently on switch, as implied by the question!

Reply to
Set Square

sorry i wasnt trying to imply that the thermostat would become a permanently on switch, however with my he35 controlled by a sunvic programmable room thermostat set at 20C and the boiler thermostat set at maximum the boiler operates until the room thermostat switches it off, when the boiler thermostat is set at the midway position the boiler switches on and off until the room thermostat is satisfied, the question was only regarding the most economical way to run the boiler

thanks andyd

Reply to
andyd

I was going to ask the same question re my own combi boiler, but I'm not sure if it's a "condensing" combi boiler. (I've never heard that term before. It's a Brittony 80 by Chaffateaux. Is that a CCB? Thanks Dave L

Reply to
Dave£

It's non-condensing

.andy

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Reply to
Andy Hall

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