Really been a big month for Rinnai Installations. I think everyone is taking advantage of the 30% off tax credit available from the federal government. Call us today to take advantage too!!!
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Pemberton Appliance January
mike@pembertonappliance.com
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Getting "Instant" Hot Water With Tankless
mike@pembertonappliance.com
Tankless water heaters do not provide instant hot water to your points of use – to do that you probably would need a re-cir system.
Re-circulation pumps or systems are a tricky issue on tankless water heaters. The main premise of a tankless water heater is that it only heats the water you use and therefore provides substantial energy savings. Re-circ. compromises these savings sending out hot water to keep a loop of piping warm until water is used, this is quite costly, I’ve seen it cost as much as $150.00/ month. So that starts us recommending timers to minimize the run time.
Now another issue needs to be looked at, as discussed in another blog the minerals(lime & calcium) re-crystalize when heated and form hard water deposits which reduce any heaters efficiency & can also cause heat exchangers to run too hot and fail. Now the goal becomes to eliminate the flowing of heated water into the tankless water heaters inlet, keep it only seeing cold water at it’s inlet. This can be accomplished by the use of re-circ. pumps or Tankless Return Solutions systems.
Tankless Return Solutions is a system which uses primary & secondary loops to keep the water warm in the plumbing loop with only part of the water when the temperature drops a predetermined delta “T” being sent thru the tankless heaters to maintain a preset temp. in the loop. This system works extremely well but is probably best suited to large residential and commercial projects due to it’s higher initial cost.
Tankless water heaters will work fine with re-circ. as long as some of these issues are considered as the system is designed & installed.
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New High Efficiency Rinnai Water Heater
Chris Wade
This fall Rinnai Corporation has released new produces featuring high efficiency condensing technology.
First, Rinnai has added 4 new condensing gas tankless water heating models. These new units feature the operational benefits of their current tankless water heater line including continuous hot water, but also provide improved energy savings and environmental benefits. Rinnai’s condensing water heaters are Energy Star qualified and deliver efficiencies up to 95%.
There are two models designed for exterior use, and two interior models. Interior models feature an innovation pipe in a pipe venting system featuring a durable polypropylene inner flue.
Second, Rinnai has entered the hydronic heating market with it’s new line of condensing wall mounted gas boilers. These gas fired models are capable of providing both heat and hot water to an entire home at efficiencies as high as 96.5%. Rinnai boilers include two series and a total of seven models. The E Series is design for homes with smaller domestic hot water requirements.The Q Series is design to provide space heating and hot water in home with high hot water loads.
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Buying a Tankless Water Heaters
admin
Buying a tankless water heater isn’t too difficult if you watch a few main concerns;1. Size the unit properly – too small a unit will result in a large pressure drop & some times erratic temperature due to improper mixing. The unit will flow the correct temp. but the pressure drop will affect anti-scald valves and cause some cold water intrusion into the hot side occasionally.
2. Make sure the gas supply is adequate for the larger flow requirements of the tankless heater. Otherwise the heater will become lower in flow capacity to the btu’s available.
3. Make sure the heater is plumbed for your future service, primarly including flush kits & valving to isolate pumps or check valves.
4. Vent heater with proper approved venting, NOT B-VENT
5. Be careful to tie re-circ. if desired compatible w/ tankless( see previous article )
6. Select an installer who stocks parts & performs service ( we’ve encountered dozens of customers who’ve told us ” I’ve loved my tankless heater until it needed service & I couldn’t find anyone who services them ” ). Start with a full service installer, you’ll benefit through-out the installation & thru your heaters life.
