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. Dragon Specifications.

SINGLE PASS SPECIFICATION
HEATER SIZE:	B2	B4	B6	B8	B12	B20	B30	B25	B35
OUTPUT KWs EQUIVALENT OIL BOILER:	25	34	46	62	94	154	312	187	380
TYPICAL NO RADIATORS:	8	9	10	14	15	20	20	20	20
FURNACE DIAMETER mm:	840	840	1140	1140	1140	1780	1780	1930	1930
FURNACE LENGTH mm:	1450	1950	1450	1950	2950	1950	2950	1950	2950
FURNACE BOILER PLATE mm:	6	6	8	8	8	10	10	10	10
EXTERNAL WIDTH mm:	1140	1140	1440	1440	1440	2080	2080	2230	2230
EXTERNAL LENGTH (inc fluebox) mm:	1850	2350	1850	2350	3350	2350	3350	2350	3350
HEIGHT EXC LEGS mm:	1140	1140	1440	1440	1440	2080	2080	2230	2230
WEIGHT KG:	800	1000	1200	1800	2500	4100	4700	4300	5300
WATER CAPACITY LTRS:	245	310	400	520	750	710	1000	780	1100
FLOW AND RETURN FEMALE CONNECTIONS:	1 x 38mm (1.5 BSP)	1 x 38mm (1.5 BSP)	2 x 38mm (1.5 BSP)	2 x 38mm (1.5 BSP)	2 x 38mm (1.5 BSP)	2 x 76mm (3 BSP)	2 x 76mm (3 BSP)	2 x 76mm (3 BSP)	2 x 76mm (3 BSP)

DOUBLE PASS SPECIFICATION
HEATER SIZE:	D2	D4	D6	D8	D12	D20	D30	D25	D35
OUTPUT KWs EQUIVALENT OIL BOILER:	30	41	56	75	113	185	374	225	456
TYPICAL NO RADIATORS:	8	9	12	16	18	25	25	25	25
FURNACE DIAMETER mm:	840	840	1140	1140	1140	1780	1780	1930	1930
FURNACE LENGTH mm:	1450	1950	1450	1950	2950	1950	2950	1950	2950
FURNACE BOILER PLATE mm:	6	6	8	8	8	10	10	10	10
EXTERNAL WIDTH mm:	1140	1140	1440	1440	1440	2080	2080	2230	2230
EXTERNAL LENGTH (inc fluebox) mm:	1850	2350	1850	2350	3350	2350	3350	2350	3350
HEIGHT EXC LEGS mm:	1540	1540	1840	1840	1840	2500	2500	2700	2700
WEIGHT KG:	900	1200	1600	2000	2900	4400	5000	4600	5600
WATER CAPACITY LTRS:	420	540	580	750	1100	960	1370	1030	1460
FLOW AND RETURN FEMALE CONNECTIONS:	1 x 38mm (1.5 BSP)	1 x 38mm (1.5 BSP)	2 x 38mm (1.5 BSP)	2 x 38mm (1.5 BSP)	2 x 38mm (1.5 BSP)	2 x 76mm (3 BSP)	2 x 76mm (3 BSP)	2 x 76mm (3 BSP)	2 x 76mm (3 BSP)

**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.