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Construction


As a HETAS registered installer we offer full instalation, construction and building services including site visit and inspection. Masonry heater would typically take around one week to complete, but some prefabricated kits can be built in a couple of days.

GENERAL CONSTRUCTION CONSIDERATIONS

An average masonry heater weights between 1500lb-5000lb (700kg-2300kg) in most installations, not counting the chimney and concrete pad. Proper footings and foundations are required and existing supports must be inspected by a competent person before being used. In a new installation, a footing must be poured on undisturbed compacted soil. A concrete block foundation is then raised and a concrete pad is poured on top of the foundation to the level of the unfinished floor. 

CHIMNEY STYLES

Masonry heaters typically require at least 18 ft (5.5m) of approximately 6"x10" (150 mm x 250 mm) or '6" diameter (150mm) chimney. Clay, refractory and stainless steel liners are suitable. Both masonry and HT (i.e. "high temperature") factory built chimneys are acceptable. Double skin insulated flues and pumice inserts can be also used. An existing chimney should be inspected by a qualified chimney sweep. The chimney can be connected on either side or at the back of the fireplace.

DAMPERS

A chimney damper is recommended in all installations to maximize the heat-storing ability of the fireplace and to ensure strong chimney draft at start-up.

WOOD STORAGE

Masonry heaters perform equally well with softwood or hardwood, lumber scraps, branches, or bundles of twigs, up to 50 lbs (22 kg) per firing. The only requirements are that the wood be dry (20% moisture or less) and suitably sized. Ideally, the pieces should be approximately of the same diameter for maximum efficiency. Reserve larger pieces (up to 6" [150 mm] diameter) for adding when the firebox is fully heated.
Outdoor wood storage must ensure that the supply is loosely stacked (criss-cross or "log-cabin" style is best) so that air can circulate around all pieces. The wood supply should have a roof to keep off rain and snow and should also be open enough to allow good ventilation.

Improper storage may prevent the wood from drying to the proper moisture content of 20%. Wood that is not dried to this level of moisture may create excess air pollution and impair the heating ability of the fireplace.

CLEARANCES AND BUILDING CODES

Masonry heaters conform to national building codes in the UK and the Government Approved Document J. Refer to building regulations BS EN 15250:2007BS EN 15544:2009, BS EN 13229 and BS 8303-1:1994.