The energy efficient way to heat domestic hot water during the summer time in centrally air conditioned homes is to have a de-superheater on the air conditioning compressor. This is a system that removes some of the heat that normally goes to your outdoor condensing col and through another heat exchanger produces hot water. This hot water is then used as the supply water to an indirect hot water heater. The additional operating costs over central air conditioning are low, the equipment capital equipment cost are high.europachris wrote:Now that summer is approaching - I have this nagging question regarding heating domestic hot water all year round with coal.... SNIP ...
Most modern homes are well insulated and have central A/C. While running coal to heat hot water might save $ per BTU, that would be offset, IMHO, by the extra cost to run the A/C to remove the extra heat load from the idling coal fire. ...SNIP... Chris
beatle78 wrote:So what boilers are insulated and what boilers are not?
Richard S. wrote:beatle78 wrote:So what boilers are insulated and what boilers are not?
Probably any boiler, the Keystoker eouropachris has is a hot air/radiant stoker with a hot water coil.
All the EFM boilers will be insulated and I'm sure the Keystokers are too. The AA's and the AHS I don't know about but I'd doubt they aren't.
The A-A Anthratube is normally not insulated, insulation was an option. The AHS Coalgun is insulated. But don't make the lack of insulation a big decision factor. Most boilers have poor insulation compared to the insulation in a modern hot water heater. More important to low summertime loss is how hot the boiler water is and does it have to be kept at the desired temperature all the time because the domestic hot water coil is in the boiler.beatle78 wrote:So what boilers are insulated and what boilers are not?