GB2158209A

GB2158209A - Detachable back boiler

Info

Publication number: GB2158209A
Application number: GB08411279A
Authority: GB
Inventors: Jonathan Leslie Greenall
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-05-02
Filing date: 1984-05-02
Publication date: 1985-11-06
Also published as: GB8411279D0; GB2158209B

Abstract

A detacheable back boiler and a solid fuel roomheater. The boiler B is fixed to the back of the stove. The damper D controls direction of flue gases and so regulates temperature of boiler, depending on hot water requirements. Because the boiler is fitted outside the stove firebox temperature is not significantly lowered by its presence, and so combustion efficiency is kept high. <IMAGE>

Description

SPECIFICATION A detachable back boiler This invention relates to a detachable back boiler with regulator for a wood, coal, or multi-fuel freestanding roomheater.

Most freestanding wood, coal, or multi-fuel roomheaters have opening doors allowing the fire to be viewed while in operation. These doors are usually kept closed to allow the fire to be controled by regulating the air supply.

Many of these stoves have various water boiler options available, some are extras and can be fitted inside the firebox of the stove at the time of purchase or later. Some boilers are integral and cannot be fitted after leaving the factory. The maximum output of heat to water from these various boilers may vary from 8,000 B.T.U. to 100,000 B.T.U. per hour.

Once the appropriate output boiler has been fitted to the stove the heat output from the boiler is regulated either by size or quality of fuel load, by regulating air supply to the firebox or restricting the pull on the fire from the flue or chimney by means of a damper or stabiliser. Sometimes plates or bricks can be fitted or grates adjusted to shield parts of the boiler and thus regulate boiler output.

In many cases these methods are inefficient and lack flexibility. Throughout the year different ammounts of hot water are needed.

Sometimes we want a large fire for visual effect but little hot water, other times we need maximum heat to water and minimum to the room. If burning wood at night we need to keep the fire smouldering but we don't want to cool the flue gases any more than we have to with cold boiler surfaces.

According to the present invention there is provided a boiler which can be fitted at the time of manufacture or at a later date, to an open- doored type roomheater as described above. With small modifications to the stove or boiler it could be fitted to many existing stoves, as well as to purpose built heaters. In some cases a detachable back boiler can be fitted in addition to an internal boiler so as to increase flexibility.

A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing in which: Figure 1 shows cross section through a typical roomheater stove A fitted with a detachable back boiler B in addition to conventional boiler C. The damper D is closed causing flue gases to circulate through the heat exchanger. A second damper E can be fitted to give extra control.

Figure 2 shows cross section through boiler B with damper D open and the flue gases bypassing heat exchanger.

Figure 3 illustrates a detachable back boiler to be fitted to a purpose made stove. In this instance boiler surface I protrudes inside stove. The boiler is fitted with reversible flue collar allowing a top or back flue outlet. The boiler has four flow and returns F positioned two at each side, there is also a facility for a thermostat to be fitted. The door C is for soot and tar removal, additional doors S can be fitted when complicated heat exchangers are required.

Figure 4 shows cross section through detachable boiler. S illustrates connection of boiler to the stove. I shows boiler inside stove. J illustrates boiler behind stove. F shows additional damper for increased control. The damper D is shown closed, this manual damper can be replaced by an automatic heat-operated damper if desired.

Referring to the drawing the boiler comprises a steel or cast iron box fitted to the stove by means of screws, bolts, and threaded holes and sealed using gasketing or mastic.

The box has a water jacket of varieing pattern and size depending an output required. For larger boiler requirements the water jacket can be incorporated into the firebox of the stove to produce greater heat transfer. The flue gases are directed by the regulating damper which can be automatic or manual depending on requirements.

1. A detachable back boiler fixed externally to a purpose made roomheating stove with means of controlling the speed and direction of flow of flue gases over its heat exchanger surface manually, thus controlling temperature of boiler and flue gases.

2. A detachable back boiler as claimed in 1 but controlled by a damper operated automatically controlled by heat.

3. A detachable back boiler as claimed in claim 1 or 2 able to be installed in addition to a conventional boiler inside stove.

4. A detachable back boiler as claimed in claim 1 or 2 and and 3 allowing either top or rear flue connection.

5. A detachable back boiler as claimed in all preceding claims with four flow and return connections and facilities for instalation of thermostat.

6. A detachable back boiler as claimed in all preceding claims able to offer a wide variation in heat exchangers available for any one stove. The variations include boilers totally behind stove with no water jacket inside stove, and boilers with water jackets and water filled baffles inside stove in addition to the boiler at the rear of stove.

7. A detachable back boiler as claimed in all previous claims but able to be adapted to fit existing stoves of various types not made with a detachable back boiler in mind.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A detachable back boiler This invention relates to a detachable back boiler with regulator for a wood, coal, or multi-fuel freestanding roomheater. Most freestanding wood, coal, or multi-fuel roomheaters have opening doors allowing the fire to be viewed while in operation. These doors are usually kept closed to allow the fire to be controled by regulating the air supply. Many of these stoves have various water boiler options available, some are extras and can be fitted inside the firebox of the stove at the time of purchase or later. Some boilers are integral and cannot be fitted after leaving the factory. The maximum output of heat to water from these various boilers may vary from 8,000 B.T.U. to 100,000 B.T.U. per hour. Once the appropriate output boiler has been fitted to the stove the heat output from the boiler is regulated either by size or quality of fuel load, by regulating air supply to the firebox or restricting the pull on the fire from the flue or chimney by means of a damper or stabiliser. Sometimes plates or bricks can be fitted or grates adjusted to shield parts of the boiler and thus regulate boiler output. In many cases these methods are inefficient and lack flexibility. Throughout the year different ammounts of hot water are needed. Sometimes we want a large fire for visual effect but little hot water, other times we need maximum heat to water and minimum to the room. If burning wood at night we need to keep the fire smouldering but we don't want to cool the flue gases any more than we have to with cold boiler surfaces. According to the present invention there is provided a boiler which can be fitted at the time of manufacture or at a later date, to an open- doored type roomheater as described above. With small modifications to the stove or boiler it could be fitted to many existing stoves, as well as to purpose built heaters. In some cases a detachable back boiler can be fitted in addition to an internal boiler so as to increase flexibility. A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing in which: Figure 1 shows cross section through a typical roomheater stove A fitted with a detachable back boiler B in addition to conventional boiler C. The damper D is closed causing flue gases to circulate through the heat exchanger. A second damper E can be fitted to give extra control. Figure 2 shows cross section through boiler B with damper D open and the flue gases bypassing heat exchanger. Figure 3 illustrates a detachable back boiler to be fitted to a purpose made stove. In this instance boiler surface I protrudes inside stove. The boiler is fitted with reversible flue collar allowing a top or back flue outlet. The boiler has four flow and returns F positioned two at each side, there is also a facility for a thermostat to be fitted. The door C is for soot and tar removal, additional doors S can be fitted when complicated heat exchangers are required. Figure 4 shows cross section through detachable boiler. S illustrates connection of boiler to the stove. I shows boiler inside stove. J illustrates boiler behind stove. F shows additional damper for increased control. The damper D is shown closed, this manual damper can be replaced by an automatic heat-operated damper if desired. Referring to the drawing the boiler comprises a steel or cast iron box fitted to the stove by means of screws, bolts, and threaded holes and sealed using gasketing or mastic. The box has a water jacket of varieing pattern and size depending an output required. For larger boiler requirements the water jacket can be incorporated into the firebox of the stove to produce greater heat transfer. The flue gases are directed by the regulating damper which can be automatic or manual depending on requirements. CLAIMS