Five steps to choosing a Dragonheater

5 Steps To Choosing Your Dragon!

Please download our terms and conditions.

1. Choosing your Dragon.

Dragon heaters come in 18 sizes to burn renewable fuel such as timber, straw and wood. The heat is transferred to a water jacket which is plumbed into your central heating system to give the most cost effective solution to rising fossil oil prices. Renewables are carbon neutral so you are also helping planet earth!

All Dragons are built to last - many are over 20 years old and still going strong. They are all fitted with a fan that controls the air and therefore the rate of burning The air is divided into two streams, the ratio is adjusted to suit your fuel. Primary air is introduced under the fuel and secondary air flow above the fuel to burn the gasses.

By controlling the air, carbon dioxide, nitrate and sulphide emissions are reduced.

Single Pass

Rugged construction will give years of trouble free, low cost heat and all your hot water. If the moisture of the fuel is over 25%, tarring may occur, but by using a well proven, simple design of the single pass Dragon this will not be a problem. There are ten sizes to suit every application.

Double Pass

The double pass Dragon has extra tubes to extract up to 30% more heat from your fuel and with less smoke emitted.

2. Which Dragon.

If your farm is geared to big bales there is a suitable Dragon. They may last 48 hours or more depending on heat requirements. Round bales can be burnt in the B20 or D20 weighing 330Kg they will yield 1500Kw.
Heston bales need the extra width of a B25 or D25 and weighing 500 Kg will yield 2300Kw.
The capacity of the smaller heaters is set out in the table below and to find out how often your heater will need loading, please see below.

No of Radiators: 8 10 12 14 16 18 20

Heating with wood: D2 D2 D4 D4 D8 D8 D12

Heating with straw: D4 D6 D6 D8 D8 D8 D12

How much heat per day?

If an existing heater is rated at 20 Kw - this is the requirement for a cold start. It will average 6 Kw an hour over 24 hours; i.e. 6 x 24 = 150 Kw per day or 25-30Kg per day.
How much fuel per year?
Calculate the daily rate (see panel above) and multiply by 180 days. You save enough in spring and autumn for summer.
Softwood = 4500 Kw/tonne and hardwood = 5600 Kw/tonne @ 20% moisture, about 30 Kg of wood or 4 bales of straw in cold weather.

How often will it be loaded?
Choose the Dragon large enough for once-a-day loading in cold weather. You can achieve the output with a smaller heater if laoding twice-a-day. Loading three times a day will give the heat but it means late-night loading.

BIG ROUND BALES will last over 24 hours depending on heat demand.
HESTON BALES require D25 to give extra width for loading

To use HESTON bales you must choose the longer version of these heaters i.e. D30 and D35 heaters to admit the length of the bale. The D20 and D25 can only take the standard ROUND bales.

3. Specification.

Double Pass Specifications
	D1	D2	D4	D6	D8	D12	D20*	D25*	D30*	D35*
Output Kw**	--	30Kw	41Kw	56Kw	75Kw	113Kw	185Kw	225Kw	374Kw	456Kw
Diameter	500	840	840	1143	1143	1143	1785	1930	1785	1930
Length	1000	1450	1980	1450	1980	2950	1950	1950	2950	2950
Furnace volume CuM	0.5	0.8	1.1	1.5	2	3	4.88	5.7	7.38	8.6
Furnace wall thickness	6	6	6	8	8	8	8	8	8	8
Height (excl. legs)	1000	1200	1200	1530	1530	1530	2690	2740	2690	2740
Width	700	1120	1120	1470	1470	1470	2000	2150	2000	2150
Length (door closed)	1150	1780	2260	1780	2260	3500	2180	2180	4160	4160
Length (door open)	1600	3020	3780	3090	3940	4280	4470	4470	6500	6500
Flue (internal diam)	150	150	150	200	200	200	200	200	200	200
Water capacity (litres)	150	660	880	760	1010	1500	1760	1700	3400	3250
Weight in Kg	N/a	900	1200	1600	2000	2900	4400	5000	4600	5600
Pipe connection	35mm(1)	35mm(1)	35mm(2)	35mm(2)	35mm(2)	35mm(2)	35mm(2)	35mm(2)	35mm(2)	35mm(2)
Single Pass Specification as above except as follows
	B1	B2	B4	B6	B8	B12	B20	B25	B30	B35
Output Kw**	15Kw	25Kw	34Kw	46Kw	62Kw	94Kw	154Kw	187Kw	312Kw	380Kw
Height (excl. legs)	700	690	690	1020	1020	1020	1730	1730	1730	1730
Flue centre height	400	490	490	820	820	820	1530	1530	1530	1530
Water capacity (litres)	120	240	310	340	440	640	1200	1140	2260	2100
Weight in Kg	600	800	1000	1200	1800	2500	4100	4700	4300	5300

**The outputs shown above are equivalent to a conventional heater, when loaded once per day. The output is doubled if loaded twice per day.

4. Flues.

FLUE FACTORS

Emissions must be lifted above the turbulance caused by the wind blowing over the buildings and clumps of trees and hill sides. Each site is different; a few odd trees are not a problem, but a nearby clump of trees may act like a building.

The last thing we want is to upset the neighbours. The legal ruling is that it shall not cause a nuisance, which can become a matter of opinion.

HOW HIGH?

Measure from floor to ridge of adjacent buildings or tree clumps (odd trees should not have much influence).

Refer to the brochure and deduct height of chosen heater.

Now add 1.2 metre (or 2.4 metre above a large building) to give flue length required.

A flue over 16m needs planning permission.

EMISSIONS

Domestic installations are below 300 Kw. - no legislation applies except that smoke shall not be a nuisance.

Between 300 Kw and 400 Kw Smoke Legislation(PG12) applies.

Over 400 Kw monitoring facilities must be available and beyond that permanent monitoring must be in place.

STAINLESS STEEL FLUE

The most popular is a prefabricated, insulated, stainless steel flue. It can be errected by unskilled labour, wihout scaffolding, and can be extended if required.

You will also need a top stub, appliance connector and locking bands, plus one fixing bracket per section. Guy wires are also available.

PUMICE FLUE

A Pumice flue liner can be inserted into an existing chimney, or a new chimney built with pumice blocks and rendered and finished to suit the property.

5. Prices.

Dragons should pay for the investment within two years, they are the cost effective solution to ever rising fossil fuel prices and the carbon released is only the carbon absorbed by the plant when growing. So you can save money and save the planet at the same time !!

Dragonheat Prices start at £2700.00, €4050.00. Payback within 2 years. Please get in touch. for up-to-date prices.

Burning renewables is the most cost effective way to save the planet. Your investment should be recovered within two years which is ten times faster than solar or wind power.