1. What foundation does a Hopealoimu stove require?

The foundation has to comply with construction regulations. The base plate has to be

– strong enough to bear stove weight
– fireproof – made of concrete or stone.

The foundation must
– havehydroinsulation

– be protected from soil moisture
– be smooth and levelled.

2. How large does the foundation have to be?

The foundation has to match the size of the fireplace or be 5-10 cm larger (you can find drawings of stove foundations under model photos or ask for the from a sales representative) and, in terms of height, reach the floor level (in case of a thin parquet floor, the foundation may be a few centimetres lower). The foundation should seat the chimney and front plate as well. The foundation may be lifted to the final height by gravel blocks or casting, which provides also insulation to the base.

3. How to build a stove to a place where it has not stood before?

If your floor is made of concrete, you need to make sure that there is no foam plastic insulation beneath it. It would crash under the weight of the fireplace and the concrete slab might crack and crash. In order to increase the load bearing capacity of the base, you need to drill 35-40 mm holes into the concrete slab and remove foam plastic from beneath it in cone-shape and fill the cone-shaped wholes with concrete. If heat cables or pipes run underneath the floor, you must not drill before having determined their exact location. In other cases, you would need to cast a base that meets the requirements. If it is not possible to build the chimney on a strong foundation, then several models can have ICS 50 metal chimneys on top.

4. Things to consider before constructing a fireplace on the second floor

You need to make sure that the ceiling can bear the stove weight and, if necessary, reinforce the ceiling. If the stove is located on a load-bearing wall, then that will suffice. You can reinforce the ceiling by connecting it with wooden or metal joists to other load-bearing structures. Ask your master builder for advice.

5. What to do when the foundation of the old fireplace does not seat the new one?

The former base needs to be lowered at least 10 cm and then a reinforced concrete slab of appropriate size can be cast on top of it. If the old base cannot be broken up and lowered, you can cast a new slab upon the old, which lifts the starting height of the stove.

6. What kind of chimney does a Hopealoimu heat storing fireplace require?

 Ready-to-install element chimneys are lightweight and have the best draught. We recommend SchiedelIsokern chimneys. If the chimney is going to have multiple flues and needs an outdoor air supply ventilation flue, you need to opt for Rondo Plus. Ready-to-install ICS 50 metal chimneys, which stand on top of stoves, are suitable for double circulation stoves and places where you need an extra lightweight chimney. The chimney should ensure proper draught and have a rain cap.

7. Does your chimney need a damper?

A heat storing fireplace needs a tightly closing damper. The best height for a damper in the chimney is at about  2 metres. This ensures the durability of the fireplace and chimney connection. If the chimney does not have a damper, it will be placed between the fireplace and the chimney.

8. How large does the connection opening have to be?

The opening has to be at least as large as the chimney cross-section, making it 1/3 times larger would be the best. Hopealoimu fireplaces require an opening of 160 mm in width and 250 mm in height. The upper edge of the chimney connection will be at 330 mm from the base of the fireplace!

9. What about a summer damper connection?

The height of a summer damper connection opening will be determined case by case.

10. Do we need a balancing air channel?

The burning process requires much air: one kilogram of wood needs about 8 m3air for burning. One fireplace load needs air of about 30 m2 room. The need for balancing air depends on the size of the room, its airtightness and ventilation system.  If the house is airtight and has exhaust-only ventilation system, the stove should be supplied with balancing air. Log houses have a sufficient amount of natural infiltration. Neither do large houses with open floor necessarily need balancing air, but a fireplace with outdoor air supply employs outside air for burning and thus prevents large amounts of warm indoor air escaping through the chimney.

11. Where should a balancing air channel be located?

We recommend bringing external air supply to the stove through the chimney ventilation flue.  This way, air for burning will be heated up by the residual heat in the chimney. The channel ends in the middle of the stove foundation, 100-200 mm from the front of the fireplace. If an underfloor air channel is used, then the last 30 cm of the channel end must be of non-combustible material since hot ash collector is right above it.

12. What are the fire safety distances?

Fire safety distances of Hopealoimu fireplaces are the following:




element – S, -A, -L

50 mm

250 mm

fractured stone surface – LK

100 mm

250 mm

hobs (from cooktop level)

500 mm

1000 mm


13. Fireplace in front of a wooden wall and chimney behind the wall

Such situation demands extra care with chimney connection. The wall around the connection must be of non-combustible material for at least 23 cm in all directions.

14. What is the size of fire protection area?

Fire protection area is an area around the fireplace where the floor has to be of fire-resistant material. In front of the fireplace at least 40 cm and at the sides at least 10 cm. Front plates which conform to fire safety regulations and are made of Silver Flame stone are available for order. It would be good if the stove foundation would seat front plates as well.

Tõmmet toetab Schiedel

Tõmmet toetab Schiedel