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How much oil does heating boiler consume per hour?
My new house is equipped, in the garage, with a wall-mounted oil-fired
central heating and hot water boiler. It is an "HRM Wallstar", approx 2' 6" high, 10" deep and 15" wide. There are 9 radiators in total. How much in litres per hour is this boiler likely to consume? This to give a comfortable temperature, but not hot, despite the current rather cold climate (I hate hot houses). I had 1,000 litres filled on 21st December (the tank was almost empty) and was pleasantly suprised the other day to see that the level has not gone down much at all since then. Obviously, the house is well insulated. The hot water is, if anything, too hot. MM |
"MM" wrote in message ... My new house is equipped, in the garage, with a wall-mounted oil-fired central heating and hot water boiler. It is an "HRM Wallstar", approx 2' 6" high, 10" deep and 15" wide. There are 9 radiators in total. How much in litres per hour is this boiler likely to consume? This to give a comfortable temperature, but not hot, despite the current rather cold climate (I hate hot houses). The data you give is meaningless. 9 radiators gives no indication at all of how big, how many panels, what you consider to be a comfortable temperature probably does not agree with someone else, what your hot water usage is, the room sizes, whether you have a detached or a terraced house of bungalow etc etc etc. So in short its impossible to give any form of sensible answer I'm afraid. I had 1,000 litres filled on 21st December (the tank was almost empty) and was pleasantly suprised the other day to see that the level has not gone down much at all since then. Obviously, the house is well insulated. The hot water is, if anything, too hot. You should have a cylinder thermostat which you can turn down but don't turn it down too far or legionella might start to grow in your system:-( |
"MM" wrote in message ... My new house is equipped, in the garage, with a wall-mounted oil-fired central heating and hot water boiler. It is an "HRM Wallstar", approx 2' 6" high, 10" deep and 15" wide. There are 9 radiators in total. How much in litres per hour is this boiler likely to consume? This to give a comfortable temperature, but not hot, despite the current rather cold climate (I hate hot houses). I had 1,000 litres filled on 21st December (the tank was almost empty) and was pleasantly suprised the other day to see that the level has not gone down much at all since then. Obviously, the house is well insulated. The hot water is, if anything, too hot. MM Post some details of your boiler, and what thermostats you can find round the place. |
On Mon, 17 Jan 2005 19:31:57 +0000, MM wrote:
How much in litres per hour is this boiler likely to consume? The documentation should have that information or it might be on the rating plate. Our big cast iron lump has a spec that around 7l/hour but it is big, 38kW output. Oil has about 10kW/l of energy so that means about 50% effiency which for ordinary cast iron conventionaly flued boiler is about right. I had 1,000 litres filled on 21st December (the tank was almost empty) and was pleasantly suprised the other day to see that the level has not gone down much at all since then. Tiddly tank then. Filled ours up with 2000l on the 23rd Oct more than half of that has gone, estimated reorder date for another 2000l is 2nd Feb, that should last until October. Drafty old stone built house with little insulation at 1400' on the North Pennines, so a little different to the sub-tropical south. B-) -- Cheers Dave. pam is missing e-mail |
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MM wrote:
My new house is equipped, in the garage, with a wall-mounted oil-fired central heating and hot water boiler. It is an "HRM Wallstar", approx 2' 6" high, 10" deep and 15" wide. There are 9 radiators in total. How much in litres per hour is this boiler likely to consume? This to give a comfortable temperature, but not hot, despite the current rather cold climate (I hate hot houses). I had 1,000 litres filled on 21st December (the tank was almost empty) and was pleasantly suprised the other day to see that the level has not gone down much at all since then. Obviously, the house is well insulated. The hot water is, if anything, too hot. MM On a 3500 sq ft house, I have got through 2200 liters since August - just about to refill. I reckon a modern well insulated 4-bed family house of half the size probably would take half that or less. Usage seems to be almost zero in 3 summer months, and twice as much in winter a spring and autumn. Which means that 2200 liters is for me autumn and half a winter. Or anbout 3 months of winter usage. So I am cracking around 700 liters a month in winter. It snot been a month since dec 21st., so I would probably have used 500 liters in that time. I would guess that you have used less than 250 liters. |
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On Mon, 17 Jan 2005 23:07:53 -0000, "Alec"
wrote: The oil consumption is on page 8 here : http://www.hrmboilers.co.uk/pdfs/wallstar.pdf Rgds Alec Thanks, Alec, for the the information I requested! MM |
On Tue, 18 Jan 2005 04:12:19 -0000, Rob Morley
wrote: In article om, "Dave Liquorice" says... On Mon, 17 Jan 2005 19:31:57 +0000, MM wrote: How much in litres per hour is this boiler likely to consume? The documentation should have that information or it might be on the rating plate. Our big cast iron lump has a spec that around 7l/hour but it is big, 38kW output. Oil has about 10kW/l of energy Watts aren't energy, they're power. Joules are energy. He meant kWhr (or electricity units if you prefer). 28sec oil, or kerosene, is 10.35kWhr/l. So 85% efficient boiler and 24.68p/l the equivalent unit price is 2.80p. BTW in case anyone is interested the figures for LPG are about 600 units in 47kg (the large bottle). So at 26.50 per bottle that 4.4p per unit. Add in the boiler efficiency and full rate electricity is cheaper than LPG! -- Malcolm Malcolm Reeves BSc CEng MIEE MIRSE, Full Circuit Ltd, Chippenham, UK , or ). Design Service for Analogue/Digital H/W & S/W Railway Signalling and Power electronics. More details plus freeware, Win95/98 DUN and Pspice tips, see: http://www.fullcircuit.com or http://www.fullcircuit.co.uk NEW - www.CharteredConsultant.co.uk - The Consultant A-List |
Quote:
I have a chart to work it all out for 35sec oil , but not 28sec oil , I dont think it would make to much difference though . |
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On Wed, 19 Jan 2005 05:30:20 -0000, Rob Morley wrote:
But when you're snowed in and the power goes down you'll be glad you use LPG instead of electricity :-) Most boilers still need electrickery to operate the gas valve and then of course there is the circulation pump... I also suspect that most people using LPG for space heating would be using bulk LPG rather than bottled. How many litres are there in a 47kG cyclinder? -- Cheers Dave. pam is missing e-mail |
On Wed, 19 Jan 2005 07:55:33 +0000 (GMT), "Dave Liquorice"
wrote: On Wed, 19 Jan 2005 05:30:20 -0000, Rob Morley wrote: I also suspect that most people using LPG for space heating would be using bulk LPG rather than bottled. Not necessarily. The installation requirements for an LPG tank are much stricter than bottles. Tanks have to be metres from the house or underground. Bottles can be right next to the house. We have both in my village, tanks in the middle of the lawn (3m from boundaries so you need a big garden) and bottles next to house on a blank wall. How many litres are there in a 47kG cyclinder? I reckon it is 24150 l, so 0.11p/l for 47kg at 26.50. How does that compare with bulk LPG? -- Malcolm Malcolm Reeves BSc CEng MIEE MIRSE, Full Circuit Ltd, Chippenham, UK , or ). Design Service for Analogue/Digital H/W & S/W Railway Signalling and Power electronics. More details plus freeware, Win95/98 DUN and Pspice tips, see: http://www.fullcircuit.com or http://www.fullcircuit.co.uk NEW - www.CharteredConsultant.co.uk - The Consultant A-List |
On Wed, 19 Jan 2005 09:29:02 +0000, Malcolm Reeves wrote:
How many litres are there in a 47kG cyclinder? I reckon it is 24150 l, eh that doesn't sound right. Our 2,500l oil tank is 6' x 4' x 4'... Maybe you are thinking of the gas volume? Which isn't how you buy LPG as gas volume is *far* too dependant on temperature and pressure. 1m^3 of propane weighs 583kg at -40C (near as damn it it's boiling point) so 47kg occupies 0.08m^3 or 80l thats more like it. so 0.11p/l for 47kg at 26.50. How does that compare with bulk LPG? Or more correctly 33p/l which fits vaugely with autogas prices... I think bulk (no road) LPG is nearer the 20p/l or less mark... -- Cheers Dave. pam is missing e-mail |
wrote in message ... On Wed, 19 Jan 2005 09:29:02 +0000, Malcolm Reeves wrote: How many litres are there in a 47kG cyclinder? I reckon it is 24150 l, so 0.11p/l for 47kg at 26.50. How does that compare with bulk LPG? I read that the propane density is 500kg per m^3, lpg is a mixture but principally propane, that gives me 94 litres to the 47kg cylinder and at GBP26.5 for 47kg about 27.5p/ltre, 4.3p/kWhr. That's far more like it. Bulk was 23p/litre when we had it and when it when up for the fourth time in a year I told them to come collect their tank and put in oil. Of course oil prices then went into overdrive as well but that's another story :-) |
On Wed, 19 Jan 2005 19:42:43 -0000, "Mike" wrote:
wrote in message .. . On Wed, 19 Jan 2005 09:29:02 +0000, Malcolm Reeves wrote: How many litres are there in a 47kG cyclinder? I reckon it is 24150 l, so 0.11p/l for 47kg at 26.50. How does that compare with bulk LPG? I read that the propane density is 500kg per m^3, lpg is a mixture but principally propane, that gives me 94 litres to the 47kg cylinder and at GBP26.5 for 47kg about 27.5p/ltre, 4.3p/kWhr. That's far more like it. Bulk was 23p/litre when we had it and when it when up for the fourth time in a year I told them to come collect their tank and put in oil. Oops. I seem to have propane as 0.5kg/m3 so I think I have missed a 1000 there somewhere. And I worked the numbers out wrong too! Doh! Sounds like bottles are not that much more than bulk 23p/l vs 27.5p/l. And we agree on the kWhr price. -- Malcolm Malcolm Reeves BSc CEng MIEE MIRSE, Full Circuit Ltd, Chippenham, UK , or ). Design Service for Analogue/Digital H/W & S/W Railway Signalling and Power electronics. More details plus freeware, Win95/98 DUN and Pspice tips, see: http://www.fullcircuit.com or http://www.fullcircuit.co.uk NEW - www.CharteredConsultant.co.uk - The Consultant A-List |
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