Efficiency of Utilities - Revision history

Marcin at 17:57, 21 February 2021

2021-02-21T17:57:38Z

← Older revision		Revision as of 17:57, 21 February 2021
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	*There is little case for gas water heater with point of use electric heaters! Which can be as efficient - as they save both standby		*There is little case for gas water heater with point of use electric heaters! Which can be as efficient - as they save both standby
	*On-demand heaters, when used with low flow - can easily use less energy than tank heaters lose in standby! In fact, we are using 1kWhr - 1/3 the very loss of tanked heaters!		*On-demand heaters, when used with low flow - can easily use less energy than tank heaters lose in standby! In fact, we are using 1kWhr - 1/3 the very loss of tanked heaters!

			=Energy Strategy=
			While impossible to track in a dumb home, a smart home system can control all energy use automatically.
			*Reduce flow of water at night to conserve on heating energy
			*Turn off all parasitic loads: turn off all circuits outside of internet/computer/lights at night.
			*Keep devices off - such as bathroom water heater - until you walk into the room.
			*Switch power to a specific room off when you leave the room
			*Don't use any devices that have parasitic loads - or turn them off at night.
			*Possibly use relays at breaker panel to time circuit turnoff.

Marcin at 17:52, 21 February 2021

2021-02-21T17:52:15Z

← Older revision		Revision as of 17:52, 21 February 2021
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			=General=
	*Heat pump is 3x as efficient as electric heat.		*Heat pump is 3x as efficient as electric heat.
	*Point of use is 27-50% more efficient than tank water heater [https://www.energy.gov/energysaver/heat-and-cool/water-heating/tankless-or-demand-type-water-heaters]		*Point of use is 27-50% more efficient than tank water heater [https://www.energy.gov/energysaver/heat-and-cool/water-heating/tankless-or-demand-type-water-heaters]
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	*Point: there is absolutely no case for gas heat with advances in heat pumps! Unless you are attracted to having a gas system in your house for some other reason. One advantage is that gas can be available even if electric dies - so gas is useful from a backup perspective. But backup heat is done better via pellet stove - cheaper and more decent(ralized).		*Point: there is absolutely no case for gas heat with advances in heat pumps! Unless you are attracted to having a gas system in your house for some other reason. One advantage is that gas can be available even if electric dies - so gas is useful from a backup perspective. But backup heat is done better via pellet stove - cheaper and more decent(ralized).
	*There is little case for gas water heater with point of use electric heaters! Which can be as efficient - as they save both standby		*There is little case for gas water heater with point of use electric heaters! Which can be as efficient - as they save both standby
	*On-demand heaters, when used with low flow - can easily use less energy than tank heaters lose in standby! In fact, we are using 1kWhr - ~~about~~		*On-demand heaters, when used with low flow - can easily use less energy than tank heaters lose in standby! In fact, we are using 1kWhr - 1/3 the very loss of tanked heaters!

Marcin at 17:51, 21 February 2021

2021-02-21T17:51:28Z

← Older revision		Revision as of 17:51, 21 February 2021
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	*Electric water heaters (tank) are about 95% efficient, while gas are about 63% efficient [https://smarterhouse.org/water-heating/replacing-your-water-heater#:~:text=The%20minimum%20efficiency%20of%20electric,to%20the%20high%20operating%20costs.]		*Electric water heaters (tank) are about 95% efficient, while gas are about 63% efficient [https://smarterhouse.org/water-heating/replacing-your-water-heater#:~:text=The%20minimum%20efficiency%20of%20electric,to%20the%20high%20operating%20costs.]
	*Efficiency factor (EF) considers standby loss but not distribution loss. Gas is 60% and electric is 90%. Tankless gets gas EF up to 82% (standby efficiency), but that doesn't consider distribution loss. Electric is 100% efficient to begin with, so standby would be near perfect efficiency. If you are at the point of use - you are close to 100% efficiency.		*Efficiency factor (EF) considers standby loss but not distribution loss. Gas is 60% and electric is 90%. Tankless gets gas EF up to 82% (standby efficiency), but that doesn't consider distribution loss. Electric is 100% efficient to begin with, so standby would be near perfect efficiency. If you are at the point of use - you are close to 100% efficiency.

			=Standby Losses=
			*Standby losses for water heaters are about 1000BTU/hr - [https://forum.heatinghelp.com/discussion/108652/hot-water-heater-standby-loss-cost-how-figure] - or about 300W!
			*1993 average was 1200kWhr/year! [https://inspectapedia.com/plumbing/Hot-Water-Heater-Standby-Losses.php]. Equivalent to 140W. That is more reasonable.

			=Cost Efficiency=
			*Electricity costs about 2x as much as gas for the thermal content - but it's lower cost if you use a heat pump.

			=Expected Hot Water Heater Usage=
			*Shower x2.5 - 6 minutes - 15 minutes
			Dishwasher - 3 times per week - or 3/7 per day - of 4.5 gallons - with 0.3 gpm water use - 15 minutes of how water at low flow. But only about 7 minutes of that.
			Washing hands and brushng teeth - 6 minutes 2.5 - 15 minutes
			*Total - 37 minutes of hot water - or 1 kWhr with a 1.6 kW water heater.

			=Conclusions=
			*Point: there is absolutely no case for gas heat with advances in heat pumps! Unless you are attracted to having a gas system in your house for some other reason. One advantage is that gas can be available even if electric dies - so gas is useful from a backup perspective. But backup heat is done better via pellet stove - cheaper and more decent(ralized).
			*There is little case for gas water heater with point of use electric heaters! Which can be as efficient - as they save both standby
			*On-demand heaters, when used with low flow - can easily use less energy than tank heaters lose in standby! In fact, we are using 1kWhr - about

Marcin at 17:27, 21 February 2021

2021-02-21T17:27:48Z

← Older revision		Revision as of 17:27, 21 February 2021
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	*induction is 20-25% more efficient than electric cooking - with induction at 90% and electric at 65-70% - [https://www.pcrichard.com/library/blogArticle/induction-vs-gas-vs-electric-cooktops/2300371.pcra#:~:text=While%20electric%20is%20certainly%20more,it%20does%20with%20electric%20cooking.].		*induction is 20-25% more efficient than electric cooking - with induction at 90% and electric at 65-70% - [https://www.pcrichard.com/library/blogArticle/induction-vs-gas-vs-electric-cooktops/2300371.pcra#:~:text=While%20electric%20is%20certainly%20more,it%20does%20with%20electric%20cooking.].
	*Electric water heaters (tank) are about 95% efficient, while gas are about 63% efficient [https://smarterhouse.org/water-heating/replacing-your-water-heater#:~:text=The%20minimum%20efficiency%20of%20electric,to%20the%20high%20operating%20costs.]		*Electric water heaters (tank) are about 95% efficient, while gas are about 63% efficient [https://smarterhouse.org/water-heating/replacing-your-water-heater#:~:text=The%20minimum%20efficiency%20of%20electric,to%20the%20high%20operating%20costs.]
			*Efficiency factor (EF) considers standby loss but not distribution loss. Gas is 60% and electric is 90%. Tankless gets gas EF up to 82% (standby efficiency), but that doesn't consider distribution loss. Electric is 100% efficient to begin with, so standby would be near perfect efficiency. If you are at the point of use - you are close to 100% efficiency.

Marcin at 17:21, 21 February 2021

2021-02-21T17:21:51Z

← Older revision		Revision as of 17:21, 21 February 2021
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	*Electric is 2x as efficient as gas - this one says 74% vs 40% efficient.		*Electric is 2x as efficient as gas - this one says 74% vs 40% efficient.
	*induction is 20-25% more efficient than electric cooking - with induction at 90% and electric at 65-70% - [https://www.pcrichard.com/library/blogArticle/induction-vs-gas-vs-electric-cooktops/2300371.pcra#:~:text=While%20electric%20is%20certainly%20more,it%20does%20with%20electric%20cooking.].		*induction is 20-25% more efficient than electric cooking - with induction at 90% and electric at 65-70% - [https://www.pcrichard.com/library/blogArticle/induction-vs-gas-vs-electric-cooktops/2300371.pcra#:~:text=While%20electric%20is%20certainly%20more,it%20does%20with%20electric%20cooking.].
			*Electric water heaters (tank) are about 95% efficient, while gas are about 63% efficient [https://smarterhouse.org/water-heating/replacing-your-water-heater#:~:text=The%20minimum%20efficiency%20of%20electric,to%20the%20high%20operating%20costs.]

Marcin at 17:14, 21 February 2021

2021-02-21T17:14:22Z

← Older revision		Revision as of 17:14, 21 February 2021
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	*Heat pump is 3x as efficient as electric heat.		*Heat pump is 3x as efficient as electric heat.
	*Point of use is 30% more efficient than tank water heater		*Point of use is 27-50% more efficient than tank water heater [https://www.energy.gov/energysaver/heat-and-cool/water-heating/tankless-or-demand-type-water-heaters]
	*Electric is 2x as efficient as gas - this one says 74% vs 40% efficient.		*Electric is 2x as efficient as gas - this one says 74% vs 40% efficient.
	*induction is 20-25% more efficient than electric cooking - with induction at 90% and electric at 65-70% - [https://www.pcrichard.com/library/blogArticle/induction-vs-gas-vs-electric-cooktops/2300371.pcra#:~:text=While%20electric%20is%20certainly%20more,it%20does%20with%20electric%20cooking.].		*induction is 20-25% more efficient than electric cooking - with induction at 90% and electric at 65-70% - [https://www.pcrichard.com/library/blogArticle/induction-vs-gas-vs-electric-cooktops/2300371.pcra#:~:text=While%20electric%20is%20certainly%20more,it%20does%20with%20electric%20cooking.].

Marcin at 17:11, 21 February 2021

2021-02-21T17:11:15Z

← Older revision		Revision as of 17:11, 21 February 2021
Line 1:		Line 1:
	*Heat pump is 3x as efficient as electric heat.		*Heat pump is 3x as efficient as electric heat.
	*Point of use is 30% more efficient than tank water heater		*Point of use is 30% more efficient than tank water heater
	*Electric is 2x as efficient as gas~~, and~~		*Electric is 2x as efficient as gas - this one says 74% vs 40% efficient.
	*induction is 20-25% more efficient than electric cooking - with induction at 90% and electric at 65-70% - [https://www.pcrichard.com/library/blogArticle/induction-vs-gas-vs-electric-cooktops/2300371.pcra#:~:text=While%20electric%20is%20certainly%20more,it%20does%20with%20electric%20cooking.].		*induction is 20-25% more efficient than electric cooking - with induction at 90% and electric at 65-70% - [https://www.pcrichard.com/library/blogArticle/induction-vs-gas-vs-electric-cooktops/2300371.pcra#:~:text=While%20electric%20is%20certainly%20more,it%20does%20with%20electric%20cooking.].

Marcin at 17:10, 21 February 2021

2021-02-21T17:10:16Z

← Older revision		Revision as of 17:10, 21 February 2021
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	*Heat pump is 3x as efficient as electric heat.		*Heat pump is 3x as efficient as electric heat.
	*Point of use is 30% more efficient than tank water heater		*Point of use is 30% more efficient than tank water heater
	*Electric is 2x as efficient as gas, and induction is 30% more efficient than electric.		*Electric is 2x as efficient as gas, and
			*induction is 20-25% more efficient than electric cooking - with induction at 90% and electric at 65-70% - [https://www.pcrichard.com/library/blogArticle/induction-vs-gas-vs-electric-cooktops/2300371.pcra#:~:text=While%20electric%20is%20certainly%20more,it%20does%20with%20electric%20cooking.].

Marcin: Created page with "Heat pump is 3x as efficient as electric heat. Point of use is 30% more efficient than tank water heater *Electric is 2x as efficient as gas, and induction is 30% more effic..."

2021-02-21T17:07:54Z

Created page with "*Heat pump is 3x as efficient as electric heat. *Point of use is 30% more efficient than tank water heater *Electric is 2x as efficient as gas, and induction is 30% more effic..."

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*Heat pump is 3x as efficient as electric heat.
*Point of use is 30% more efficient than tank water heater
*Electric is 2x as efficient as gas, and induction is 30% more efficient than electric.