3 ms·
Probably they're less efficient or more dangerous? Just taking a guess here.
by bagels 4y ago
Probably they're less efficient or more dangerous? Just taking a guess here.
- Scoundreller 4y agoThat’s likely it: high efficiency (“condensing”) burners need a powered vent for the draft. The amount of heat extracted means a “natural” draft is chancy. And for ignition since they don’t use/waste a pilot light.